Need this ASAP! A parabola opening up or down has vertex (0,0) and passes through (-20, 20). Write its
equation in vertex form.

Below.

Step-by-step explanation:

F(x) = (x - 20)(x + 20)

f(x) = x^2 - 400     This opens upwards.

If it opens down we have:.

f(x) = -(x - 20)(x + 20)

f(x) = -x^2 + 400.

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c