How do you write the vertex form equation of the parabola #y = -2(x+4)(x-2)#?
Please see the explanation.
Multiply the factors:
Please observe that equation  is in the standard form
The vertex form of a parabola of this type is:
The "a" in the standard form and the "a" in the vertex form are the same attribute of the parabola, therefore, substitute -2 for "a" into equation :
We know that
Substitute -1 for h into equation :
Evaluate equation  at
Evaluate equation  and x = 0 and y = 16, then solve for k:
The vertex form is: