Find a quadratic model for the set of values. (–2, –20), (0, –4), (4, –20)?
A. y = 4x2 + 4x + 2
B. y = 2x2 - 4x + 4
C. y = 4x2 - 2x - 4
D. y = -2x2 + 4x - 4
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A. y = 4x2 + 4x + 2
B. y = 2x2 - 4x + 4
C. y = 4x2 - 2x - 4
D. y = -2x2 + 4x - 4
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This shape is concave down by examination so y = -kx² + ...., which leaves D as the only possible solution.
D. y = -2x2 + 4x - 4