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
1 answer