Select the Quadratic Functions That Are Concave Upward $y=-4 x-6 x^{2}-9$

Multiple Choice

Select the quadratic functions that are concave upward.

A) $y=-4 x-6 x^{2}-9$
B) $y=7 x^{2}-2 x+7$
C) $4 y-5 x^{2}=-5-5 x$
D) $5 x^{2}+3 y=12$