Question

Which quadratic function opens down and has a vertex with a negative y value?

A. f(x)= 5x^2-18
B. g(x)= -4x^2+7x+20
C. h(x)= -1/2(x-9)^2+1
D. j(x)= -10(x+6)^2 -3

Answer 1

It's D.

Explanation:

The function with a negative coefficient of x^2 will open downwards so its either B, C or D. The y value of the vertex is the last constant.

So the answer is D with negative y value -3.