CTJan27 Online Math Methods - Polynomials

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Polynomial Long Division

Questions for: Polynomial Long Division

1

Perform the polynomial division: $(x^2 + 5x + 7) \div (x + 2)$. What is the result?

$x - 3 + \frac{1}{x+2}$

$x + 3$

$x + 3 + \frac{1}{x+2}$

$x + 7 + \frac{21}{x+2}$

2

When $x^3 - 4x^2 - 7x + 10$ is divided by $x - 5$, what is the quotient?

$x^2 - 9x + 38$

$x^2 + x - 2$

$x^2 + x + 2$

$x^2 - x - 2$

3

Find the remainder when $2x^3 - 5x^2 + 3x - 1$ is divided by $x - 3$.

$23$

$-1$

$0$

$17$

4

A polynomial has a missing term. Divide $4x^3 - 9x + 5$ by $2x - 1$. What is the result? Remember to write the dividend as $4x^3 + 0x^2 - 9x + 5$.

$2x^2 + x - 4$

$2x^2 - x - 5$

$2x^2 - 4$

$2x^2 + x - 4 + \frac{1}{2x-1}$

5

If the result of dividing a polynomial $P(x)$ by $(x+4)$ is $x^2 - 2x + 3$ with a remainder of $-5$, what is the polynomial $P(x)$?

$x^3 + 6x^2 + 11x + 7$

$x^3 - 2x^2 + 3x - 5$

$x^3 + 2x^2 - 5x + 7$

$x^3 + 2x^2 - 5x - 17$

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Synthetic Division

Questions for: Synthetic Division

6

Use synthetic division to find the quotient of $(x^3 + 2x^2 - 5x - 6) \div (x - 2)$.

$x^2 - 4x + 3$

$x^3 + 4x^2 + 3x$

$x^2 + 4x + 3$

$x^2 + 3$

7

What is the remainder when the polynomial $P(x) = 2x^3 - 3x^2 + 4x - 7$ is divided by $x + 1$?

$-16$

$-6$

$16$

$0$

8

When performing synthetic division for $(x^4 - 3x^2 + 5x - 1) \div (x - 3)$, what is the correct quotient?

$x^3 + 3x^2 + 6x + 23$

$x^2 + 5$

$x^3 + 6x + 23$

$x^3 - 3x^2 + 6x - 13$

9

Using synthetic division, find the remainder of $(4x^3 - 5x + 2) \div (x + 2)$.

$0$

$-20$

$24$

$28$

10

For which of the following division problems can synthetic division be directly applied in its standard form?

$(x^3 + 1) \div (x^2 + 1)$

$(x^5 - 3x^2 + 2) \div (x + 5)$

$(x^2 + x + 1) \div (x^3 + 2)$

$(2x^4 - x) \div (2x - 1)$

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The Remainder Theorem

Questions for: The Remainder Theorem

11

According to the Remainder Theorem, what is the remainder when the polynomial $P(x) = x^3 + 2x^2 - 5x + 1$ is divided by $(x - 2)$?

$7$

$5$

$-1$

$11$

12

Find the remainder when $P(x) = 2x^3 - x^2 + 3x - 4$ is divided by $(x + 1)$.

$-10$

$-6$

$-8$

$0$

13

When the polynomial $f(x) = x^3 + kx^2 - 3x + 5$ is divided by $(x - 1)$, the remainder is $7$. What is the value of $k$?

$k = 0$

$k = 9$

$k = -10$

$k = 4$

14

What is the remainder when the polynomial $P(x) = 4x^3 - 5x + 2$ is divided by the linear factor $(2x - 1)$?

$24$

$4$

$0$

$1$

15

The Remainder Theorem states that if a polynomial $P(x)$ is divided by a linear factor $(x - a)$, the remainder is equal to which of the following?

$P(-a)$

$P(0)$

$a$

$P(a)$

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The Factor Theorem

Questions for: The Factor Theorem

16

According to the Factor Theorem, which of the following is a factor of the polynomial $P(x) = x^3 - 2x^2 + 5x - 10$?

$(x-2)$

$(x+2)$

$(x+1)$

$(x-1)$

17

If $(x+3)$ is a factor of the polynomial $f(x) = x^3 + kx^2 - x - 21$, what is the value of the constant $k$?

$k = -1$

$k = 1$

$k = -3$

$k = 3$

18

The Factor Theorem states that for a polynomial $P(x)$, a binomial $(x-a)$ is a factor if and only if:

$P(x) = a$

$P(a) = 0$

$P(0) = a$

The remainder is $a$

19

Given the polynomial $g(x) = 2x^3 - 5x^2 - 4x + 3$, which of the following is a factor?

$(x+2)$

$(x-2)$

$(x-1)$

$(x+1)$

20

If $(2x-1)$ is a factor of a polynomial $P(x)$, which of the following statements must be true based on the Factor Theorem?

$P(1/2) = 0$

$P(-1/2) = 0$

$P(1) = 0$

$P(-1) = 0$

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Factoring Higher-Degree Polynomials

Questions for: Factoring Higher-Degree Polynomials

21

Completely factor the polynomial $P(x) = x^3 - 2x^2 + 5x - 10$.

$(x+2)(x^2-5)$

$(x+5)(x^2-2)$

$(x-2)(x^2-5)$

$(x-2)(x^2+5)$

22

Which of the following is a factor of the polynomial $f(x) = x^3 - 7x - 6$?

$(x+2)$

$(x+3)$

$(x-2)$

$(x-1)$

23

Factor the polynomial $g(x) = x^4 - 81$ completely.

$(x-3)(x+3)(x^2+9)$

$(x^2-9)(x^2+9)$

$(x-3)^2(x+3)^2$

$(x-3)(x+3)(x-3i)(x+3i)$

24

What is the complete factorization of the polynomial $h(t) = t^3 + 64$?

$(t+8)(t-8)$

$(t+4)(t^2+4t+16)$

$(t-4)(t^2+4t+16)$

$(t+4)(t^2-4t+16)$

25

Factor the polynomial $P(y) = y^4 - 3y^2 - 4$ completely.

$(y^2-1)(y^2+4)$

$(y-2)(y+2)(y^2+1)$

$(y-2)(y+2)(y^2-1)$

$(y-1)(y+1)(y^2-4)$

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The Rational Root Theorem

Questions for: The Rational Root Theorem

26

According to the Rational Root Theorem, which of the following is a complete list of all possible rational roots of the polynomial $P(x) = x^3 - 4x^2 + x + 6$?

$1, 2, 3, 6$

$\pm1, \pm2, \pm3$

$\pm1, \pm6$

$\pm1, \pm2, \pm3, \pm6$

27

Consider the polynomial $f(x) = 3x^3 + 2x^2 - 7x + 2$. Which of the following is a list of all possible rational roots?

$\pm1, \pm3, \pm\frac{1}{2}, \pm\frac{3}{2}$

$\pm1, \pm2$

$\pm1, \pm2, \pm3, \pm\frac{1}{2}, \pm\frac{3}{2}$

$\pm1, \pm2, \pm\frac{1}{3}, \pm\frac{2}{3}$

28

For the polynomial $P(x) = 2x^4 - 5x^3 + x^2 - 4$, which of the following numbers cannot be a rational root?

$4$

$2/3$

$2$

$-1/2$

29

What is the primary purpose of the Rational Root Theorem?

To provide a finite list of possible rational roots to test.

To find all irrational and complex roots of a polynomial.

To determine the exact number of positive real roots a polynomial has.

To guarantee that every polynomial has at least one rational root.

30

A polynomial is given by $f(x) = 6x^3 - 11x^2 - 4x + 4$. Using the Rational Root Theorem, which of the following values is a possible rational root of $f(x)$?

$1/4$

$3$

$2/3$

$3/4$

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Finding Zeros of Polynomial Functions

Questions for: Finding Zeros of Polynomial Functions

31

A 'zero' of a polynomial function $P(x)$ is a value of $x$ for which...

the graph of $P(x)$ crosses the y-axis

$P(x) > 0$

$P(0)$ is defined

$P(x) = 0$

32

Find all the zeros of the polynomial function $f(x) = (x-2)(x+3)(x-5)$.

${-2, -3, -5}$

${2, 3, 5}$

${2, -3, 5}$

${-2, 3, -5}$

33

Which of the following is a zero of the polynomial $P(x) = x^3 - 2x^2 - 5x + 6$?

$x = 2$

$x = -1$

$x = -3$

$x = 3$

34

What are all the real zeros of the polynomial function $g(x) = x^3 - x^2 + 4x - 4$?

${1, -4}$

${1, 2, -2}$

${1}$

${-1, 4}$

35

Consider the polynomial function $h(x) = x(x+1)^3(x-4)^2$. What is the multiplicity of the zero at $x = -1$?

$3$

$1$

$2$

$6$

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Solving Polynomial Equations and Inequalities

Questions for: Solving Polynomial Equations and Inequalities

36

What are the solutions to the polynomial equation $x^3 - 2x^2 - 5x + 6 = 0$?

${1, 2, 3}$

${-1, 2, -3}$

${-1, -2, -3}$

${1, -2, 3}$

37

Find the solution set for the inequality $x^2 - 3x - 10 > 0$.

$(-\infty, -2) \cup (5, \infty)$

$(-\infty, -2] \cup [5, \infty)$

$[-2, 5]$

$(-2, 5)$

38

Which of the following is the solution to the inequality $(x+1)(x-3)(x-5) \le 0$?

$[-1, 3] \cup (5, \infty)$

$(-\infty, -1] \cup [3, 5]$

$[-1, 3] \cup [5, \infty)$

$(-\infty, -1) \cup (3, 5)$

39

Solve the polynomial equation $x^3 + 2x^2 - 9x - 18 = 0$ by factoring.

${2, 9}$

${-2, 3, -3}$

${-2, 9}$

${2, 3, -3}$

40

What is the solution set for the polynomial inequality $(x-4)^2(x+2) > 0$?

$(-\infty, -2)$

$(-2, 4)$

$(-2, \infty)$

$(-2, 4) \cup (4, \infty)$

41

Find all the real roots of the polynomial equation $x^3 - 2x^2 - 5x + 6 = 0$.

${1, 2, 3}$

${1, 6, -1}$

${-1, -3, 2}$

${-2, 1, 3}$

42

Solve the polynomial inequality $x^2 - 5x + 4 < 0$.

$1 < x < 4$

$-1 < x < 4$

$x < 1$ or $x > 4$

$x < -4$ or $x > -1$

43

What is the solution set for the inequality $(x+2)(x-1)(x-3) \ge 0$?

${x | -2 \le x \le 1 }$

${x | x \le -2 \text{ or } 1 \le x \le 3 }$

${x | -2 \le x \le 1 \text{ or } x \ge 3 }$

${x | x \le -2 \text{ or } x \ge 3 }$

44

Which of the following polynomial equations has a root at $x=0$ with multiplicity 2, and a root at $x=5$ with multiplicity 1?

$2x^2 - 10x = 0$

$x^2 - 5x = 0$

$x^3 - 5x^2 = 0$

$x^3 + 5x^2 = 0$

45

The solution to the inequality $P(x) > 0$ is the set of all $x$-values for which the graph of $y=P(x)$ is...

...to the left of the y-axis.

...on the x-axis.

...below the x-axis.

...above the x-axis.

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