Question

The graphs below have the same shape. What is the equation of the red graph?

Answer 1

D. g(x) = -x^2

Explanation:

Took the test

Answer 2

We claim that the answer is
`y=-x^2.` Since the two graphs both open down, and all the answer choices, in addition to the equation of the blue graph, are quadratic polynomials, the leading coefficient must be negative. This immediately rules out answer choices A, B, and C, leaving D as the answer.