Question

What value of a would make the graph of f(x)= ax2 open up?

A. -8
B. 0
C. 10
D. -21

Answer 1

The equation is unsolvable when the 'a' variable is in it, so if we take it out, then all of them would make the equation open up.

Sorry for not giving a definite answer, but that is what I got.

Hope that this helps!