Answers LAUSD-Pre-Calculus B PrescriptiveUnit Test

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What is the first step when rewriting y = 3x2 + 9x – 18 in the form y = a(x – h)2 + k?

3 must be factored from 3x2 + 9x

x must be factored from 3x2 + 9x

9 must be factored from 9x – 18

3 must be factored from 3x2 – 18

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Which equation is y = 2x2 – 8x + 9 rewritten in vertex form?

y = 2(x – 2)2 + 9

y = 2(x – 2)2 + 5

y = 2(x – 2)2 + 1

y = 2(x – 2)2 + 17

Which equation has a graph that is a parabola with a vertex at (5, 3)?

y = (x – 5)2 + 3

y = (x + 5)2 + 3

y = (x – 3)2 + 5

y = (x + 3)2 + 5

Which pair of equations generates graphs with the same vertex?

y = –(x + 4)2 and y = (x – 4)2

y = –4x2 and y = 4x2

y = –x2 – 4 and y = x2 + 4

y = (x – 4)2 and y = x2 + 4

What is the first step when rewriting y = 6x2 + 18x + 14 in the form y = a(x – h)2 + k?

16 must be factored from 18x + 14

x must be factored from 6x2 + 18x

6 must be factored from 6x2 + 14

6 must be factored from 6x2 + 18x

Which phrase best describes the translation from the graph y = (x + 2)2 to the graph of y = x2 + 3?

2 units left and 3 units up

2 units left and 3 units down

2 units right and 3 units up

2 units right and 3 units down

Which phrase best describes the translation from the graph y = 6x2 to the graph of y = 6(x + 1)2?

6 unit left

6 unit right

1 unit left

1 unit right

Which equation is y = 6x2 + 12x – 10 rewritten in vertex form?

y = 6(x + 1)2 – 11

y = 6(x + 1)2 – 10

y = 6(x + 1)2 – 4

y = 6(x + 1)2 – 16

How does the graph of y = a(x – h)2 + k change if the value of h is doubled?

The vertex of the graph moves to a point twice as far from the x-axis.

The vertex of the graph moves to a point twice as far from the y-axis.

The vertex of the graph moves to a point half as far from the x-axis.

The vertex of the graph moves to a point half as far from the y-axis.

Which equation has a graph that is a parabola with a vertex at (–2, 0)?

y = –2x2

y = (x + 2)2

y = (x – 2)2

y = x2 – 2

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