Quadratic Functions: Vertex Form — Unit test Answers
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On a coordinate plane, a parabola opens up. It starts in quadrant 1, crosses the x axis where the vertex is in quadrant 4, and crosses the x-axis back into quadrant 1.
A
f(x) = (x – 8)2 + 6B
f(x) = (x + 8)2 + 6C
f(x) = (x + 8)2 – 6D
f(x) = (x – 8)2 – 642
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Which function has an axis of symmetry of x = −2?
A
f(x) = (x − 1)2 + 2B
f(x) = (x + 1)2 − 2C
f(x) = (x − 2)2 − 1D
f(x) = (x + 2)2 − 143
Which point is an x-intercept of the quadratic functionf(x) = (x – 8)(x + 9)?
A
(0,8)B
(0,–8)C
(9,0)D
(–9,0)44
Mary throws a plastic disc to her friend. Her friend catches the disc six seconds after Mary throws it. The table shows the height of the disc at one-second intervals.
A
A = 5, B = 3B
A = 4, B = 0C
A = 4, B = 3D
A = 5, B = 045
Given the function f(x) = −5x2 − x + 20, find f(3).
A
−28B
−13C
62D
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