Completing the Square (Continued) Answers

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1
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Which statement is true concerning the vertex and axis of symmetry of h(x)=−2x2+8x?

A
The vertex is at (0, 0) and the axis of symmetry is x = 2.
B
The vertex is at (0, 0) and the axis of symmetry is y= 2.
C
The vertex is at (2, 8) and the axis of symmetry is x = 2.
D
The vertex is at (2, 2) and the axis of symmetry is y = 2.
2
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What is the first step in writing f(x) = 6x2 + 5 – 42x in vertex form?

A
Factor 6 out of each term.
B
Factor 6 out of the first two terms.
C
Write the function in standard form.
D
Write the trinomial as a binomial squared.
4

Which is one of the transformations applied to the graph of f(x)=x2 to produce the graph of g(x)=2x2−28x+3?

A
shifted up 3 units
B
shifted left 7 units
C
shifted right 7 units
D
shifted down 3 units
5

Which statement is true concerning the vertex and the axis of symmetry of g(x)=5x2−10x?

A
The function written in vertex form is g(x)=5(x−1)2−5. The vertex is at (1, –5) and the axis of symmetry is x=1.
B
The vertex is at (1, –5) and the axis of symmetry is y = 1.
C
The vertex is at (0, 0) and the axis of symmetry is x = 1.
D
The vertex is at (0, 0) and the axis of symmetry is y = 1.
7

The first steps in writing f(x) = 3x2 – 24x + 10 in vertex form are shown.f(x) = 3(x2 – 8x) + 10 = 16

Question illustration
A
f(x) = 3(x + 4)2 – 6
B
f(x) = 3(x + 4)2 – 38
C
f(x) = 3(x – 4)2 – 6
D
f(x) = 3(x – 4)2 – 38
9

What is f(x) = 8x2 + 4x written in vertex form?

A
f(x) = 8 –
Option A
B
f(x) = 8 –
Option B
C
f(x) = 8 – 2
Option C
D
f(x) = 8 – 4
Option D
10

What is the vertex of g(x) = –3x2 + 18x + 2?

A
(3, –25)
B
(–3, –25)
C
(3, 29)
D
(–3, 29)

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