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P5.3: Roots/Zeros & Multiplicity

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Last updated over 4 years ago
15 questions
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For a review of how zeroes relate to the graph, watch this video.
For more review and a discussion of multiplicity, watch this video.

You will find Desmos helpful for this homework.
For a review of how zeroes relate to the graph, watch this video.
For more review and a discussion of multiplicity, watch this video.

You will find Desmos helpful for this homework.
Question 1
1.

Find the zeros of the function.

f(x) = x2(x-1)4(x+5)

Use x={#, #, #} format, with exactly one space after each comma. List the roots in increasing order.

Question 2
2.

Which root from f(x) = x2(x-1)4(x+5) has a multiplicity of 2?

Enter your answer as a number (the x-value of the root), no spaces.

Question 3
3.

Find the zeros of the function.

f(x) = x3 - 12x2 + 35x

Use x={#, #, #} format, with exactly one space after each comma. List the roots in increasing order.

Question 4
4.

Question 5
5.

Find the zeros of the function.

f(x) = -8x3 - 20x2

Use x={#, #} format, with exactly one space after the comma. List the roots in increasing order.

Question 6
6.

For #5, at which root does the graph bounce?

Enter your answer as a number, no spaces.

Question 7
7.

For #5, at which root does the graph pass through the x-axis?

Enter your answer as a number, no spaces.

Question 8
8.

A polynomial has zeros at -1, 2, and 7, all with multiplicity 1. In addition, its leading coefficient is 1. Write the function in standard form.

Use c1x3 + c2x2 + c3x + c4 format, no spaces, with cn being your coefficients.

Question 9
9.

A polynomial has zero at 0 with multiplicity 1, a zero at 1 with multiplicty 2, and a zero at 5 with multiplicity 1. In addition, its leading coefficient is 1. Write the function in standard form.

Use c1x4 + c2x3 + c3x2 + c4x format, no spaces, with cn being your coefficients.


STUDY this and #8. There will be one like this on the quiz.

Question 10
10.

Find the zeros of the function.

f(x) = x3 - 10x2 + 27x - 18

Use x={#, #, #} format, with exactly one space after each comma. List the roots in increasing order.

Question 11
11.

Find the zeros of the function.

f(x) = -x4 - 7x3 - 12x2

Use x={#, #, #} format, with exactly one space after each comma. List the roots in increasing order.

Question 12
12.

Question 13
13.
Consider the function

f(x) = x^{3} -3x + 1

f(x) is increasing on __________ and decreasing on __________.
f(x) has a relative max at __________ and a relative min at __________.
f(x) has a range of __________.
Question 14
14.

REVIEW

Write the polynomial in standard form, no spaces.

2x(x+1)^{2} - (5x^{2} - x)

Question 15
15.

REVIEW

Write the quotient in standard form, no spaces.

\frac{3x^{4} - 72x + 9x^{2}}{3x}

Which best describes the graph of the function in #3?
The graph bounces at one zero, and passes across the x-axis at two zeroes.
The graph bounces at two zeroes, and passes across the x-axis at the other.
The graph passes across the x-axis at all of its zeroes.
The graph bounces at all of its zeroes.
Review

Categorize the functions according to their end behaviors.

This will turn green when all answers are in the right spot
2 - x^{2}
x^{2} + 3x - 5
a binomial with a negative leading coefficient
1 - x
5x^{5} + 64x
an odd degree polynomial with a negative leading coefficient
an odd degree polynomial with a positive leading coefficient
4x
6 - x^{3}
x\rightarrow\infty, f(x)\rightarrow\infty;
x\rightarrow -\infty, f(x)\rightarrow \infty
x\rightarrow\infty, f(x)\rightarrow\infty;
x\rightarrow -\infty, f(x)\rightarrow -\infty
x\rightarrow\infty, f(x)\rightarrow -\infty;
x\rightarrow -\infty, f(x)\rightarrow \infty
x\rightarrow\infty, f(x)\rightarrow -\infty;
x\rightarrow -\infty, f(x)\rightarrow -\infty
Not enough info