PreCalc Chapter 2 Test Part 2 Flashcards Preview

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Flashcards in PreCalc Chapter 2 Test Part 2 Deck (56)
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how do you factor a perfect cube

in the first (), take the cubed root of both variables in the equation
in the second (), first, put in whatever you need to get the leading coefficient, then put in the opposite of the product of the first (), then whatever you need to get the constant

1

factor x^3+8

(x+2)(x^2-2x+4)

2

is (x-1)(x^2+x+1) a product of linear factors

no, simplify the last trinomial by doing quadratic formula to get a product of linear factors

3

is x^2 + 49 factorable?

yes
(x-7i) (x+7i)

4

what is the rational zero test

p(constant)/q (leading coefficient
some factors of both of these things will present a zero of the equation

5

what are the possible root combinations for a cubed equation

all real, 2 imaginary and one real

6

what does lower bound say

you plug in a negative number and get alternating sums in return,
this will be your lowest zero

7

what is upper bound

you plug in a higher number and get all positive sums in return
this will be your highest zero

8

what is DesCartes's Rule of signs

the number of positive real zeros=the number of sign variations or less than that by an even integer
the number of negative real zeros=the number of sign variations at
f(-x) or less than that by an even integer

9

what does irreducible over the reals mean

does not reduce into real factors
x^2-2x+10

10

write x^6-x^7 as a product of linear factors

(x)(x)(x)(x)(x)(x)(1-x)

11

The _______ _______ of _______ states that if f(x) is a polynomial of degree n (n>0), then f has at least one zero in the complex number system

fundamental, theorem, algebra

12

The _______ ________ _______ states that if f(x) is a polynomial of degree n (n>0), then f(x) has precisely n linear factors

linear factorization theorem

13

The test that gives a list of the possible rational zeros of a polynomial function is the ______ _______ Test

rational zero

14

If a+bi is a complex zero of a polynomial with real coefficients, then so is its ________, a-bi

conjugate

15

Every polynomial of degree n>0 with real coefficients can be written as the product of _______ and ______ factors with real coefficients, where the ___________ factors have no real zeros

polynomial, linear, quadratic

16

A quadratic factor that cannot be factored further as a product of linear factors containing real numbers is said to be _______ over the _______

irreducible, reals

17

The theorem that can be used to determine the possible numbers of positive real zeros and negative real zeros of a function is called __________ __________ of ________

Descartes's Rule, Signs

18

A real number b is a ______ bound for the real zeros of f when no real zeros are less than b, and is a ______ bound when no real zeros are greater than b

lower, upper

19

if 5i is a zero, what else is true

-5i is a zero

20

a set of ordered pairs

relation

21

what is a rational function

fraction with polynomials

22

how do you find the vertical asymptote

whatever makes the denominator 0
roots of denominator
x=
be sure to factor function first as asymptotes might cancel

23

how do you find the horizontal asymptote if numerator's degree is < denominator's degree

y=0
it is the x-axis

24

how do you find HA if the numerator's degree=denominator's degree

y=ratio of leading coefficients
f(x)=2x-5/4-x HA:y=-2

25

how do you find the HA if you numerator's degree > denominator's degree by 1?
by 2?

by 1: y=quotient slant asymptote
by 2: y=quotient parabolic asymptote

26

how do you find x intercepts and y intercepts of a rational function

x: roots of numerator (set=0) make sure to factor first in case things cancel
y: plug 0 in for x
NOTE- be sure to write as ordered pairs, (0,0) is not a y or x intercept

27

what is intermediate form? is it the same as undefined

0/0, no

28

slant asymptotes and parabolic asymptotes all begin with

y=
so do HA
VA begins with x=

29

functions of the form f(x)=N(x)/D(x), where N(x) and D(x) are polynomials and D(x) is not the zero polynomial are called ______ _______

rational functions