What is the equation of the parabola in intercept form?

Question

X-intercept of -16 and -2; passes through (-18,72)

Answer 1

y = k(x+16)(x+2)

72 = k(-18+16)(-18+2)

72 = k(-2)(-16)

72 = 32 k

k = 72/32 = 36/16 = 18/8 = 9/4

y = (9/4)(x+16)(x+2)