Q: Erer. i vi S I5 JE= -J(8)(8)(8) = 8. . Prime factors. Chapter 4: Exponents and Radicals. 4.1 Square Roots and Cube Roots. q& z9 (0. a..51 =-4.
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1 A 24 2 = 12 2 = 6 2=3 qi=q(s)(5)(s)= 5 Example: Example: Tree Method: o&t jt I 4.1 Square Roots and ube Roots hapter 4: Exponents and Radicals 1 ube 3( 5 U, Definitions: 9 k11 a ube root Square root 3 G) Review Example: The prime factorization of 24 is 2 x 2 x 2 x 3 Prime Factorization: the process of writing a number written as a product of its prime factors. JE= J(8)(8)(8) = 8 Q: Erer S I5 ube Root: one of three equal factors of a number i vi 2 64=(4)(4)(4)=4 5ayare rco4 o Snuare Root: one of two equal factors of a number Example: Example: an hcc Perfect Square: A number that can be expressed as thq produqof two equal factors, Perfect ube: A number that is the product of three equal factors Outcome: Demonstrate an understanding of factors of whole numbers by determining the:. Prime factors a..51 =4 1. Evaluate the following. 1 +.z t7 27 = (3)(3)(3) = 33 Greatest common factor Least common multiple 16 = (4)(4) or42 25(5)(5)or52 36=(6)(6)or62 3 LI Lj q& z9 ( Math 1O Name:
2 Relationship between Square Roots and Perfect Squares (ube roots and Perfect ubes) ya neither. + NHL\ (3 I H 5 b) 512 lot I 2 I a 5tQ 3 c) 356 Method 3: alcu = U Li 2 1Tr1 z The number c,o is a perfect square. It is formed by multiplying the same number, twice together. The square rootof is LI H This is the same for perfect cubes and cube roots, however, the only difference is you the perfect cube is formed by multiplying the same number three times together. Example 1: Identifying Perfect Squares and Perfect ubes State whether each of the following numbers is a perfect square or a perfect cube, both, or a) 144 Method 1: Tree Method Method 2: Factor out perfect squares/cubes N 3 Method 1: Tree Method 3 Method 2: Factor out perfect squarelcubes
3 Q) mini Ix 2L 1w (p >Im I cn A A,cD U) I II i i U M p p W (13 D I I 3 II ii U 1ci ç I tj U III X6 Xj Nil X X V IQi rj Lj
4 Example 4: 11N Key Ideas an joo e\i&1uc4c 1ne t&\iuuolflcs? 4 The volume of a cubic box is 27 in3. Use two methods to determine it s dimensions, D L4io.4 % e,an2oc volume o S i; in 2ocstn3S_\ A perfect square is the product of two equal factors. One of these factors is called the square root. o 25 is a perfect square: = 5 because 52 = 25 A perfect cube is the product of three equal factors. One of these factors is called the cube root. o 2l6isaperfectcube: J 2l6 6 because(6)3=125 Some numbers will be BOTH a perfect square AND a perfect cube. o l5625isaperfectsquare:1252=15625 o is a perfect cube: 25 = You can use diagrams or manipulatives, factor trees, or a calculator to solve problems involving square roots and cube roots. Textbook Questions: Pg #14, 6, 9, 1
5 Review: 4.2 Integral Exponents 1. Identify the base and the exponent, then evaluate the power. S 2. Simplify and evaluate the following. (hint: you ll need to use exponent laws) a. 42x45= t tl3 / (3y3nq b. (52)(53)= )a3 c. (32)7 = 4, Outcome: Demonstrate an understanding of powers with integral exponents. What is an integral exponent? Integer number: is a whole number that can be either positive, negative, or zero. Example: (..., 3,, 1, O,, 2,3,... N Exponent: determines how many times to multiply a number. Usually to the right and above the base. Example: ) ombine the two.. S 1 Integral Exponent: the exponent of a number is either a positive or negative whole number. Examples: (5.2)? 5
6 Note that a and / are rational or variable bases and m and n are the integral exponents. a = 41 2 /2 b4 Method 2: Use Positive Exponents 7,.(J_) p 6 1!*!*!*REMEMBER THE EXPONENT LAWS*!*!*! Exponent Law Example Product of Powers (32) (34) = 32+4 = 32 (am )(a?) = m + Quotient of Powers = (x3h5)) x8 Powerofa Power 2.75 = O.75 (am) atm11 (.75 ) = 43 O 64 Power of a Product (4_f3 = (ab) = (a )(b ) Power of a Quotient y2 = (32 = 32 = kb! h T Zero Exponent (4.2) = (4,2) = Power of a Negative Exponent 43 = J. I a,ao Quotient of Negative Power = 32 b a, ao Example 1: Write each product or quotient as a power with a single exponent. a) (76)(T2) Use the exponent laws for multiplying or dividing powers with the same base. Method 1: Add the exponents i L
7 U 4 II 7 c1: t. ers w:s s cm o re, t i nfl LU s I U II ii 4 o o ons Si 7 M Sju, 1 qi I %_1 %_ i I U t x o a a oo 4 U a. Lsl nj ) 9 o O 3 U %7 7rir o a a Wrs E U, e a; Q D o a a) I a) c :LL) o D D o WI 4 II WV) a).. nj5>o?4 t II A o im
8 I S (.q a (3) 2 exponents. (a ) = a a = I, a Textbook Questions: Pg #1, 2, 36, 8, 1. 8 Example 3: Manitoba Agriculture, Food and Rural Initiatives staff conducted a grasshopper count. In one 25 km2 rea, there were 41 grasshoppers. Use the following table to assess the degree of asshopper infestation in this area. m \3 nn 7 Grasshopper Density... \ 4persquaremetreverylight \jocornj 5cooccs / \ \cye \ c 1 58 per sqargmetre = light 912 per square metre = moderate 2 / per square metre= severe Win \. t 25 per square metre = very severe lcoo&xyn / ;coo Key Ideas A power with a negative exponent can be written as a power with a positive exponent. o Example: 2= = () You can use the exponent laws to simplify. Exponent Laws Note that a and Li are rational or variable bases and m and n are the integral Product of Powers Power of a Product ( a )(d ) = a (oh) = (a )(b ) Quotient of Powers Power of a Quotient = a a (9i =, b L Power of a Power Zero Exponent Power of a Negative Exponent Quotient of Negative Power =o, a a, a *
9 Review: Evaluate the following: 43 a) 4.3 Rational Exponents (ql(l1 ]L1X4 )(L\N bla b) 43 j = L Outcome: Demonstrate an understanding of powers with rational exponents. Definition Rational Exponents: the power of a number is in the form of a fraction. Example: 4 Example 1 Write each expression as a power with a single exponent. a) (x )(x) x ),StD S 9 o.5.5 L1 fiz\ Noke J ra.. J.. 3 t: Example 2: Simplify and evaluate where possible. a) (27x6) 7(X%) 1; 7 9
10 ) b) Xe3) Example 3: I osy,o Jn.i formula? ccu.)vr c5 53 ::ex1er (os% I 9j3 A e \kcp e fers I \2 ) P\= 5ceo( 5ca3 (I A 5cc LI.LjJ) 1 I+ 3 aylie invests S5 in a fund that increases in value at a rate of 12.6% per year. The bank = )( provides a quarterly update on the value of the investment using the formula A = 5OOO(1.126) where q represents the number of quarterly periods and A represents the a) Whatisthe relationship between the interest rate of 12.6% and the value in the?ujs an odia S RY bo, Orv1O+ 4Ld.L I I 1 b) What is the value of the investment after the 3rd quarter? ç7illjç) A 5ooo(i.o9O c) What is the value of the investment after 3 years? (b%s enonk.i cqg4fl5 ae ;E\ final amount of the investment. inke esa tqf.
11 11 Textbook Questions: Pg #1,36,8, 1, 12. V6 = Note that a and b are rational or variable bases and m and n are the integral exponents. Exponent Laws. You can apply the above principle to the exponent laws for rational expressions a ( 9f = (9)1.3 You can write a power with a negative exponent as a power with a positive exponent. Key Ideas fractional form.. A power with a rational exponent can be written with the exponent in decimal or a =, a = a, a Power of a Negative Exponent Quotient of Negative Power (a ) = a a 1. a Power of a Power Zero Exponent ff = a a,lo =, bo Quotient of Powers Power of a Quotient (a )(a ) = a + (nb) = Product of Powers Power of a Product
12 jtfl flc It cm f3 (_ rz i, s D w z 3 D 4 3 n ì n fb I g ; ; $> 3 a arp c a D, n md g1 r o 1 Q)g 2 (no fl r es 4 L2 in > 2 2 P r N (t S z DI D 1 k3 5? L!z D ) D o 5 ( a U D D a D D rn z = 3. D 1 o a I D B 2 tcn (V x D, ft 5 r vi D ( ) V 1 n tel (1 :3c 4, ft rt 9. p 9 Q A ss V. D p 7 rio EPa z rig (Ar I 1, ( ) D N D I D ( zrb _p ; p cm p D r PS
13 15 ci. [;o 13 rokibno\ caaigt 8 (27) 6 iii akiu ca irakimai ctt lassify the following numbers as rational, irrational, or neither. You may use a calculator. Example 2: L cna1 =1 Identify the numbers as rational or irrational. You may use a calculator. Explain how you know. Example 1: Ordering irrational numbers Representing, identifying, and simplifying irrational numbers 2) Demonstrate an understanding of irrational numbers by: Outcome: 1) Demonstrate an understanding of powers with rational and integral exponents. 4.4 Irrational Numbers fli I,e) g).1 1) ii 3. Determine which sets each number belongs to. In the graphic organizer, shade in the sets. fl_ fl a) 4 h) c) d) 7 a
14 o] $5 c ( ) Key Ideas Rational Numbers and irrational numbers form the set of real numbers. You can order radicals that are irrational numbers using a calculator to produce approximate values. 14 Example 3: Use a number line to order these numbers from least to greatest. 3.L_n J I & I \ ; a Example 4: Assume the Seabee Mine doubles its daily gold production to 36cm3. What is the length of a cube of gold produced in a fiveday period? (note the formula for volume, V, of a cube is V = s3) 3 Ocrn3 *5 Vr S3
15 15 c) (x4 Iqr OR Index: indicates what root to take a) 1O Radicand: the quantity under the radical sign rack car Radical: consists of a root symbol, an index, and a radicand Definitions: 2) Demonstrate an understanding of irrational numbers by: Representing, Outcome: 1) Demonstrate an understanding of powers with rational and integral exponents. 4.5 Mixed and Entire Radicals Express each radical as a power with a rational exponent. Example 2: power as an equivaj9fladica = = irrational numbers Ordering A power can be expressed as a radical in the form: x = = ( f?) I, LU I,, in b) 1O24 %OoH [jjojj Express each Example 1: 3* identifying, and simplifying irrational numbers I 3 = TT
16 n Definitions: Mixed radical: the product of a rational number and a radical. Example: 2J and Entire radical: the product of I and a radical. Example: and Example 3: Identify whether the radical is a mixed radical or a entire radical. miec Example 4: a)9 = 47io Express each mixed radical as an equivalent entire radical. b) 4.2Jt z)x xio 16
17 Radicals can be entire radicals such as and They can also be mixed radicals Textbook Questions: Pg. 192 #11 exponent. Key Ideas 1[. f5t7 Express each entire radical as an equivalent mixed radical. such as 6 4[and25. You can convert between entire radicals and mixed radicals. The index of the radical has the same value as the denominator of the fractional Example 5: vm= io1 qxm = Radicals can be expressed as powers with fractional exponents. a 17
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