AnswersWHS OH-Algebra I B-CRUnit Test

Unit Test — Unit test Answers

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21
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What is the axis of symmetry for the function f(x)=7−4x+x2?

A
x = –3
B
x = –2
C
x = 2
D
x = 3
22
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An algebra tile configuration. Only the Product spot is shown. 8 tiles are in the Product spot in 3 columns with 3 rows. First row: 1 + x squared, 2 + x. Second row: 1 +x, 2 +. Third row: 1 +x, 1 +.

Question illustration
A
1
B
2
C
3
D
4
23

The first three steps in writing f(x) = 40x + 5x2 in vertex form are shown.Write the function in standard form.f(x) = 5x2 + 40xFactor a out of the first two terms.f(x) = 5(x2 + 8x)Form a perfect square trinomial. = 16 f(x) = 5(x2 + 8x + 16) – 5(16)What is the function written in vertex form?

Question illustration
A
f(x) = 5(x + 4) – 80
B
f(x) = 5(x + 8) – 80
C
f(x) = 5(x + 4)2 – 80
D
f(x) = 5(x + 8)2 – 80
24

The graph of which function has an axis of symmetry at x = 3?

A
f(x) = x2 + 3x + 1
Option A
B
f(x) = x2 – 3x – 3
Option B
C
f(x) = x2 + 6x + 3
Option C
D
f(x) = x2 – 6x – 1
Option D
25

The image of a parabolic lens is projected onto a graph. The image crosses the x-axis at –2 and 3. The point (–1, 2) is also on the parabola. Which equation can be used to model the image of the lens?

A
y = (x – 2)(x + 3)
Option A
B
y = (x – 2)(x + 3)
Option B
C
y = (x + 2)(x – 3)
Option C
D
y = (x + 2)(x – 3)
Option D

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