Beginning Algebra MAT0024C. Professor Sikora. Professor M. J. Sikora ~ Valencia Community College

Transcription

1 Beginning Algebra Professor Sikora MAT002C

2 POLYNOMIALS

3 6.1 Positive Integer Exponents x n = x x x x x [n of these x factors] base exponent Numerical: Ex: - = where as Ex: (-) = Ex: - = and Ex: (-) = Rule: Neg # to even exponent = #, Neg # to odd exponent = #, 2 Ex: =

4 6.1 Power Rules for Exponents POWER OF A QUOTIENT b 0 a b m = a b m m Ex: Simplify x 0 Ex: 2x y 2 x

5 6.1 Zero Exponents same ZERO EXPONENT [x 0] x o = 1 cuz 0 & 1 Ex: (-7) 0 = Ex: -7 0 = Ex: -(-7) 0 =

6 6.1 Neg. Integer Exponents NEGATIVE EXPONENT[a 1 2 a -n = cuz 2 5 & a n 5 0, n integer] same 1 Ex: Simplify -2 Ex: Simplify - -2 Ex: Simplify (-) -2 Ex: Simplify 1 a 1 n = a n

7 6.1 Neg. Integer Exponents NEGATIVE to POSITIVE EXPONENTS [a, b x y m n 0; m,n integers] = y x n m Ex: Simplify h m 2 5 k Ex: 5 2 Ex: x 8y 6 7

8 6.1 Scientific Notation:application of exponents Scientific Notation form: a x 10 n 1 < a < 10 n Integers Move Decimal pt. to right of 1 st nonzero digit Count # of places moved [no move 10 0 ] Large #s have positive power of 10 Small #s have negative power of 10 Ex: Write in Sci. notation: ,000 Ex: Write w/o exponents: 8.7 x x 10 -

9 6.2 Defining Polynomials Polynomial Ex: x + 5x 2 + 2x 2 + 8x + 1 Terms separated by + or - signs Coefficient number (w/ sign) in front of var. Like Terms same variable to same power Unlike Terms diff. variable or diff. power Polynomial = a term or sum of terms where all variables have whole # exponents {0,1,2,, }

10 6.2 Classifying Polynomials Polynomial = Monomial or sum of Monomials Monomial: a number or Product a variable of these Exponents must be positive Names for Special Polynomials: Monomial(1 term) Ex: y 2 or 2abc or -5 Binomial(2 terms) Ex: y 2 + 2abc or -5+x Trinomial ( terms) Ex: y 2 + 2abc - 5

11 6.2 Classifying Polynomials State if each of the following is a polynomial. If it is, state if it is a Monomial, Binomial, or Trinomial a - 7bc x 2 + 7x - 7y - y x y 2 z r r

12 6.2 Classifying Polynomials Degree of a Monomial = sum of variables of exponents Degree of a Polynomial = greatest degree of any monomial term Monomial Degree Polynomial Degree y 2 2 y 2 + 2abc 5 2abc y 7 + y 6 + x m -1 p 5 + p m +m 9xyz x 2 + xy 2 +abc

13 6.2 Evaluating Polynomial Functions Evaluate: -x + x 2x + for x = 0 for x = 1 for x = - Evaluate: c 2 + c + 7 for c = -6 19

14 6.2 Arranging Polynomials Polynomials are arranged in powers of one variable: ascending order or descending order ascending order descending order + 5a - 6a 2 + 2a 2a - 6a 2 + 5a x +x 2 x 2-2x -5 When several variables are in the terms, write in order of only one variable.

15 6.2 Combine Like Terms a 2a b b 1 a b a b Strike through like terms in the given polynomial as they are combined a 2a b b 1 a b a b 2 a 5 2 a b a +a b 5

16 6. Adding Polynomials To ADD Polynomials: Group LIKE terms together [LIKE terms have same variable to same power ==> can be combined!] OR Place in COLUMN form [In DESCENDING order with LIKE terms aligned!]

17 6. Adding Polynomials ADD these Polynomials: Ex: (9y - 7x + 15a) + (-y + 8x - 8a) Ex: (a 2 + ab - b 2 ) + (ab + 6b 2 )

18 6. Subtracting Polynomials To SUBTRACT Polynomials: Find the Additive Inverse (opposite) of polynomial after (-) sign[ & place opposite sign above] Group LIKE terms together & Add OR Place in COLUMN form [ original signs original signs & place opposite sign above]& Add

19 6. Subtracting Polynomials SUBTRACT these Polynomials: Ex:(7a - 10b) - (a + b) Ex:(y 2 + 7y + 8) - (2y 2 - y + ) Ex:(-8t + t 2 7t - 9) - (-10t 5t 2 + t - 11)

20 Mini-Quiz ) xy ) 2x + x ) Eval: -2x 2 + x 1 for x = ) Simplify: 5) (y 2 2y) y(2y + ) 6) (x 2 + 2x) + (5x 2 8x) 7) (9x 2 + x + 7) 2(11x 2 5x + 9) 8) Subtract: 20 x + 12x 12x + 7x 2 7x 1) Simplify: 2) ) Classify the Polynomial & state degree 9) Copy & Complete the table: x a) Write in scientific notation: 728 & b) Write in standard notation: 7.5 x 10 x 2y z 2 z

21 6. Product Rule for Same Base Exponents PROD. OF POWERS a m. a n = a m + n Bases must be the same! Simplify each [Multiply coefficents 1 st ]: (21c 6 )(c 7 ) (8x )(x) (2a )(2a b 2 )(-ab )

22 6. Product Rule for Exponents We multiply numbers in scientific notation using the same procedure we used to multiply monomials. Monomials: a 2a 2a 6 6 8a 9 Scientific notation: Ex: (.2 x 10 5 )(2.8 x 10 8 ) Ans: x 10 1

23 6. Power of a power Rule (a m ) n = a mn Ex: (x ) = x x x x =x 12 Simplify: Ex: (2 2 ) = Ex: (2a 2 b ) 5 = Ex: (-5a 2 b 6 ) = Ex: Simplify (-5mn )(-2mp 2 ) (1.5m 2 n) = Ans: 60m 6 n 5 p 6

24 6. Power Rules for Exponents POWER OF A PRODUCT (ab) m = a m b m Simplify means: No powers of powers, each base only once, & fractions reduced Ex: (x 2 y) = Ex: (a ) (a ) 2 =

25 6. Using more than 1 rule Simplify: (6b y) 2 [(-y) 2 ] Simplify: (x y z 6 ) 2 [(2x 2 y 2 ) 2 ]

26 6.5 Multiply Polynomial by Monomial Remove parentheses & Simplify: Ex: 2(a 2 a) + 5(a 2 + 2a) Use distributive Prop w/ ARROWS Ex: 5x(x 2 + 2x + 1) - x(x - ) Ex: 2a 2 b a b ab 5a bc

27 6.5 Multiplying Binomial by Binomial F L If 2 Binomials (x - )(x + ) = I + O (a + 11)(5a - 2) = (5y 2z)(2y + z) = (x + )(2x - 1) + 2x(x 1) = use FOIL - add outer & inner terms under = sign

28 6.5 Multiplying Polynomial by Binomial Use 1 of these Methods: 1. BOX 2. LONG MULTIPLICATION. MULTIPLE DISTRIBUTIVE and

29 6.5 Multiplying Polynomial by Binomial Use 1 st of these Methods: (2x + )(x 2 + x + 8) = 2x x 2 x 8

30 6.5 Multiplying Polynomial by Binomial Use 2 nd of these Methods: 2. LONG MULTIPLICATION (2x + )(x 2 + x + 8) =

31 6.5 Multiplying Polynomial by Binomial Use rd of these Methods:. MULTIPLE DISTRIBUTIVE and (2x + )(x 2 + x + 8) =

32 6.5 Multiplying Polynomial by Binomial Solve using your favorite Method: 1. BOX 2. LONG MULT.. MULTIPLE DISTRIB. (2x - 1)(x 2 - x + ) =

33 FOIL 6.5 Multiplying Conjugates (a + b)(a - b) = a 2 - b 2 (x - )(x + ) = EASY! Same binomials with different middle signs (x - 2y)(x + 2y) = (6x - 20y)(6x + 20y) =

34 6.5 Special Binomial Products Exs. using SQUARE OF SUM: (a + b) 2 = a 2 + 2ab + b 2 Sq. 1 st term; twice prod. of 2 terms; sq. last term (x + 5) 2 = (a + 2) 2 = (5b + 7c) 2 =

35 6.5 Special Binomial Products SQUARE OF DIFFERENCE: FOIL (a - b) 2 = (a - b)(a - b) = a 2-2ab + b 2 Sq. 1 st term; twice prod. of 2 terms; sq. last term (x - ) 2 = (a - 2) 2 = (6x 2-10y) 2 =

36 6.6 Quotient Rule for Exponents 2 Develop a pattern: = 2 1 QUOTIENT OF POWERS [a 0] = a a m n = a m - n

37 6.6 Dividing By Monomials Exs. of QUOTIENT OF POWERS: 18x y z 2xy 6 2 = yz x = x x x 0

38 Exponents Summary Assume that no denominators are 0, that a and b are real numbers, and that m and n are integers. Zero as an exponent: a 0 = 1, where a is indeterminate. Negative exponents: n n n a, a, 1 1 n a a Product rule for exponents: a a a Quotient rule for exponents: a a a m n mn Raising a power to a power: a a Raising a product to a power: ab a b Raising a quotient to a power: n n n m n m n m n m n a b n n n a b n a b b a n

39 6.6 Division of Polynomials Polynomial by Monomial: each term of poly. by mono. = + Ex: Divide 12m m 5 + 0m Note: Omit Objective 5 pages 5 57=>Dividing by a Binomial by 6m 2 a c b c 0 a c b c Ans: 2m + m + 5m 2

40 6.6 Division of Polynomials Ex: xy x y x y x Ex: Divide: (x + y) 2 (x y) 2 by Simplify first! xy 12x y x 2 xy

41 Mini-Quiz Review 1-5 Multiply 1) (x y )(-x 5 y) 2) -5x (x 2 + x 6) ) (a )(5a + 2) ) (5y ) 2 5) (2x 1)(5x 2 + x ) 6-9 Simplify: 6) p 12 p 7) (2w) (w 2 ) 2 8) 2 9) a 6 a 5 a y z 5 z ) 5 2w 12w 2 w 2