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Writing Polynomial Functions from Complex Roots Answers

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Which second degree polynomial function has a leading coefficient of –1 and root 4 with multiplicity 2?

A
f(x) = –x2 – 8x – 16
B
f(x) = –x2 + 8x – 16
C
f(x) = –x2 – 8x + 16
D
f(x) = –x2 + 8x + 16
2
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If a polynomial function f(x) has roots 4 – 13i and 5, what must be a factor of f(x)?

A
(x + (13 – 4i))
B
(x – (13 + 4i))
C
(x + (4 + 13i))
D
(x – (4 + 13i))
3

Which polynomial function could be represented by the graph below?

Question illustration
A
f(x) = x3 + x2 – 6x
B
f(x) = x3 – x2 – 6x
C
f(x) = –2x3 – 2x2 + 12x
D
f(x) = –2x3 + 2x2 + 12x
6

If a polynomial function, f(x), with rational coefficients has roots 0, 4, and , what must also be a root of f(x)?

Question illustration
A
3 + i StartRoot 11 EndRoot
Option A
B
Negative 3 + i StartRoot 11 EndRoot
Option B
C
3 minus StartRoot 11 EndRoot
Option C
D
Negative 3 minus StartRoot 11 EndRoot
Option D
8

Which polynomial function has a leading coefficient of 3 and roots –4, i, and 2, all with multiplicity 1?

A
f(x) = 3(x + 4)(x – i)(x – 2)
B
f(x) = (x – 3)(x + 4)(x – i)(x – 2)
C
f(x) = (x – 3)(x + 4)(x – i)(x + i)(x – 2)
D
f(x) = 3(x + 4)(x – i)(x + i)(x – 2)
10

Which polynomial function could be represented by the graph below?

Question illustration
A
f(x) = x2 – 6x + 8
B
f(x) = 3x2 – 18x + 24
C
f(x) = x2 + 6x + 8
D
f(x) = 3x2 + 18x + 24

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