Question

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

Answer 1

For this case, we have that by definition, the graphs of the quadratic equations that open downwards fulfill the following:

Let:

$ax ^ 2 + bx + c = 0$

The coefficient "a" is negative. That is to say:

$a <0$

Then, the equations:

$v = 60x-15x ^ 2\\v = -5-2x ^ 2$

opens downward

Answer:

Option A and C