Tell whether each equation is written in general form, vertex form, or factored form. Write each equation in the other two forms, if possible.
a. y = 2(x - 2)2 - 16
b. y = -3(x - 5)(x + 1)
c. y = x2 + 3x + 2
d. y = (x + 1)(x - 3)(x + 4)
e. y = 2x2 + 5x - 6
f. y = -2 - (x + 7)2