Which of the following quadratic functions has a graph that opens downwards?

check all that apply

A. y=2x^2-9x+3

B. y=x^2+4x+8

C. y=-(5+2x^2)

D. y=60x-15x^2

3 answers

that would have to be an even power, with a negative coefficient on the highest power.
would it be c and d?
correct