AnswersAlgebra III AQuadratic Functions: Vertex Form

Completing the Square Answers

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Which function in vertex form is equivalent to f(x) = 4 + x2 – 2x?

A
f(x) = (x – 1)2 + 3
B
f(x) = (x – 1)2 + 5
C
f(x) = (x + 1)2 + 3
D
f(x) = (x + 1)2 + 5
5

The vertex form of a function is g(x) = (x – 3)2 + 9. How does the graph of g(x) compare to the graph of the function f(x) = x2?

A
g(x) is shifted 3 units left and 9 units up.
B
g(x) is shifted 3 units right and 9 units up.
C
g(x) is shifted 9 units left and 3 units down.
D
g(x) is shifted 9 units right and 3 units down.
6

Which statements are true about the graph of the function f(x) = 6x – 4 + x2? Select two options.The vertex form of the function is f(x) = (x – 2)2 + 2.The vertex of the function is (–3, –13).The axis of symmetry for the function is x = 3.The graph increases over the interval (–3, ).The function does not cross the x-axis.

Question illustration
A
The vertex form of the function is f(x) = (x – 2)2 + 2.
B
The vertex of the function is (–3, –13).
C
The axis of symmetry for the function is x = 3.
D
The graph increases over the interval (–3, ).
Option D
E
The function does not cross the x-axis.
7

Which statements are true about the graph of the function f(x) = x2 – 8x + 5? Select three options.The function in vertex form is f(x) = (x – 4)2 – 11.The vertex of the function is (–8, 5).The axis of symmetry is x = 5.The y-intercept of the function is (0, 5).The function crosses the x-axis twice.

A
The function in vertex form is f(x) = (x – 4)2 – 11.
B
The vertex of the function is (–8, 5).
C
The axis of symmetry is x = 5.
D
The y-intercept of the function is (0, 5).
E
The function crosses the x-axis twice.
9

Which values for h and k are used to write the function in vertex form?

Question illustration
A
h=6, k=36
B
h=−6, k=−36
C
h=6, k=30
D
h=−6, k=−30

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