Use the parabola tool to graph the quadratic function f(x)=−12x2+7. graph the parabola by first plotting its vertex and then plotting a second point on the parabola.

First we find the vertex of parabola 

The vertex of parabola is 
Here,
b = coefficient of x term
a = coefficient of x² term

For given parabola, b = 0 , a = -12

So,


And,



Thus the vertex of parabola is (0, 7)

To find another point on parabola, substitute x by 1.



So the second point on parabola is (1,-5)

The plot of parabola is shown in image below:

Ithink the answer is a