1.1 Basic Algebra. 1.2 Equations and Inequalities. 1.3 Systems of Equations
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1 1. Algebra
2 1.1 Basic Algebra 1.2 Equations and Inequalities 1.3 Systems of Equations
3 1.1 Basic Algebra
4 1.1.1 Algebraic Operations Factoring and Expanding Polynomials Introduction to Exponentials Logarithms
5 1.1.1 Algebraic Operations
6 We need to learn how our basic algebraic operations interact. When confronted with many operations, we follow the order of operations: Parentheses Exponentials Multiplication Division Addition Subtraction
7 Simplify the following expression 2 (2 + 4) (3 2)
8 Manipulating Fractions Fractions are essential to mathematics Adding fractions: a b + c d = ad + bc bd Multiplying fractions: a b c d = ac bd Improper fractions: a b c d = ad bc
9 Compute:
10 Compute: x 2 y 7 + y3 x 4
11 Powers and Roots For any positive whole number n, xn = x x... x {z } If y = x n, we say x is an n th root of y. n times Roots undo powers, and vice versa. We denote n th roots as p or. n x x 1 n Notice that: x 1 n n =x 1 n n =x 1 =x
12 Simplify: 4p
13 3 2 Solve for x : x = 81
14 1.1.2 Factoring and Expanding Polynomials
15 Polynomials y = x 2 Polynomials are functions that are sums of f(x) =x 1 nonnegative integer powers of the variables. f(r) =4r 2 9 The highest power is called the degree of the y = x 2 +2x 1 polynomial. Higher degree f(x) =x 6 x +1 polynomials are generally harder to understand.
16 First Order Polynomials These are just lines: y = ax + b
17 Second Degree Polynomials y = ax 2 + bx + c We can try to factor quadratics, i.e. write as a product of first order polynomials.
18 Expanding Quadratics (a + b)(c + d) 6= ac + bd (a + b)(c + d) =ac + ad + bc + bd One can undo factoring by expanding products of polynomials. One must take care with distribution. (ax + b)(cx + d) =acx 2 +(ad + bc)x + bd
19 Expand (x + 3)( 2x 1)
20 Factor x 2 +4x +3
21 Roots of Quadratics These can be found by factoring, and also with the famous quadratic formula: ax 2 + bx + c =0, x = b ± p b 2 4ac 2a
22 Find Roots of x 2 x 5
23 Higher Order Polynomials These can also be factored, though it is usually harder. Formulas like the quadratic formula exist for degree 3,4, polynomials. Nothing for degree 5 and higher.
24 1.1.3 Introduction to Exponentials
25 x y The number x is called the base. The number y is called the exponent. Examples include: x 2 (base x, exponent 2) and 2 x (base 2, exponent x) When someone refers to an exponential function, they mean the variable is in the exponent (i.e. ), not the base ( ) x 2 2 x
26 Properties of Exponents Basic Rules: a x+y = a x a y (same base, different exponents) a x b x =(ab) x (different base, same exponent) (a x ) y = a xy (iterated exponents) x 0 =1 for any value of x (convention)
27
28
29 1.1.4 Logarithms
30 y = log a (x) We call a the base. Logarithms are a compact way to solve certain exponential equations: y = log a (x), a y = x
31 Properties of Logarithms Logarithms enjoy certain algebraic properties, related to the exponential properties we have already studied. log (xy) = log (x) + log (y) a a a (logarithm of a product) log a x y = log a (x) log a (y) (logarithm of a quotient) (logarithm of an exponential) log a (x y )=y log a (x) log a (1) = 0 (logarithm of 1 equals 0) log a (a) =0
32 Logarithm as Inverse of Exponential log a (a x )=a log a (x) = x
33
34 1.2 Equations
35 1.2.1 Linear Equations and Inequalities Quadratic Equations Higher Order Polynomials Exponential and Logarithmic Equations Absolute Value Equations
36 1.2.1 Linear Equations and Inequalities
37 Equations of the form y = ax + b We want to compute values of x given y and vice versa. Sometimes we need to perform some algebraic rearrangements first.
38 Solve for x :2=4x 3
39 Linear Inequalities Linear equations can be broadened to linear inequalities of the form y apple mx + b, with,<,> potentially in place of. apple Since y = mx + b defines a line in the Cartesian plane, linear inequalities refer to all points on one side of a line, either including ( ) or excluding ( ) the line itself. apple, <, >
40 Solve for x :3x 3 apple 1
41 1.2.2 Quadratic Equations
42 Quadratic refers to degree two polynomials. Quadratic equations are equations involving degree two polynomials: y = ax 2 + bx + c Unlike linear equations, in which simple algebraic techniques were sufficient, finding solutions to quadratics requires more sophisticated techniques, such as: Factoring Quadratic Formula Completing the Square
43 Quadratic Formula A formulaic approach to solving quadratic equations is the quadratic formula: 0=ax 2 + bx + c, x = b ± p b 2 4ac In particular, quadratic equations have two distinct roots, unless b 2 4ac =0. 2a
44 Quadratic Inequalities ax 2 + bx + c 0 Solving quadratic inequalities can be made easier with the observation that AB 0,A 0 and B 0 or A apple 0 and B apple 0 This suggests factoring our quadratic, and examining when each linear factor is positive or negative.
45 Similarly, AB apple 0,A 0 and B apple 0 or A apple 0 and B 0 Again, we see that if we can factor our quadratic into linear factors, we can examine each factor individually. Indeed, supposing that our quadratic inequality has the form x 2 + bx + c 0, we can factor x 2 + bx + c =(x )(x ) and examine the corresponding linear factors.
46 Solve for x : x 2 6x +5apple 0
47 Rates of Change of Quadratic Functions A useful characterization of quadratic polynomials is that their rate of change is a linear function. This is an early result in calculus, but we will not prove it.
48
49 1.2.3 Higher Order Polynomials
50 One can also consider polynomials of degree higher than 2. These are generally harder to analyze and plot. One can use basic heuristics, however, in addition to graphing calculators.
51 Odd degree polynomials have the two tails pointing in opposite directions. Even degree polynomials have the two tails pointing in the same direction. Odd degree polynomials always have at least one (real) root, while even polynomials need not.
52 Plot f (x) = x 3
53 Plot f(x) = x 4 +4
54 Number of Roots A degree n polynomial has at most n 1 distinct real roots. It has has at most n minima and maxima.
55 Find all roots of (x 2 4)(x + 2)(x 1) 2
56 1.2.4 Exponential and Logarithmic Equations
57 These may look daunting! However, we can use our exponential and logarithmic properties (tricks) to make our lives easier; see Lecture 1.3,1.4. Recall that y = a x, log (y) =x. a From this, we can approach many equations that look intimidating.
58 Solve for x :4 x 1 = 16
59 Solve for x : log 2 (x) =3
60 x Solve for x : e > e 2x
61 1.2.5 Absolute Value Equations
62 Recall the absolute value function, which is equal to a number s distance from 0: x = ( x, x 0 x, x < 0 In other words, the absolute value function keeps positive numbers the same, and switches negative numbers into their positive counterpart.
63
64
65 Equations with Absolute Value When considering equations of the form: f(x) = g(x) it suffices to consider the two cases f(x) =g(x) and f(x) =g(x) In the case of absolute value equations involving first order polynomials (linear functions), we get: ax + b = c, ax + b = c or (ax + b) =c
66 Solve for x : 2x 5 =1
67 Inequalities Involving Absolute Values When considering systems of absolute value inequalities, great care must be taken. In general, f(x) apple g(x), ( f(x) apple g(x) and f(x) > 0 f(x) apple g(x) and f(x) apple 0 A similar equivalence holds for f(x) g(x)
68 Linear Absolute Value Inequalities One can, when working with inequalities of the form ax + b apple c or ax + b c proceed by finding the two solutions to ax + b = c and (ax + b) =c then plotting these on a number line, and checking in which region the desired inequality is achieved. This is the number line method.
69 Solve for x : x +2 =apple 5
70 1.3 Systems of Equations
71 1.3.1 Systems of Equations and Inequalities Higher Order Systems
72 1.3.1 Systems of Equations and Inequalities
73 A classic area of mathematics is solving two or more systems of equations or inequalities simultaneously. On classic formulation is: find the intersection of two lines, given their equations
74 System of Linear Equations The problem of finding the intersection of two lines may formulated as the algebraic problem of finding the simultaneous solution to system of linear equations ( y = m 1 x + b 1 y = m 2 x + b 2 Classical solution method: Set the two expressions on the right equal and solve for x, then go back and solve for y.
75 ( Solve : 3x +4 =y 4x 7 = y
76 It is possible to mix other types of equations into systems. The same techniques as before work. While more complicated ( y =3x +4 y = x 2 + x +1 looking, this system can be solved with our substitution method, combined with the quadratic formula.
77 Systems of Inequalities One can also study regions in the Cartesian plane in which a inequalities are simultaneously satisfied. In the case of linear inequalities, these may be of the form: ( y apple m 1 x + b 1 ( y m 1 x + b 1 ( y m 1 x + b 1 y apple m 2 x + b 2 y apple m 2 x + b 2 y m 2 x + b 2
78 ( Solve : 2x +1 x +2 apple y apple y
79 1.3.2 Higher Order Systems
80 We have so far considered systems of equations with two variables and two unknowns. In general, it is possible to consider more equations and more unknowns. On the CLEP exam, it is good to know how to solve linear systems with three variables and three unknowns. 8 These look like: for coefficients >< a 1 x + b 1 y + c 1 z = d 1 a >: 2 x + b 2 y + c 2 z = d 2 a 3 x + b 3 y + c 3 z = d 3 a i,b i,c i,d i,i=1, 2, 3
81 These systems can be solved by Gaussian elimination a.k.a. row reductions. Basically, equations are added and subtracted to isolate variables. It is long and tedious. For CLEP questions, checking each purported solution may be more time-efficient than directly solving the system.
82 8 >< x + z =1 Solve 2x +2y =1 >: 3y z =2
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