Question

find the cubic equation that has a y intercept of (0, -4) and has roots at x=1, x=2, and x= -5

Answer 1

y = a (x-1)(x-2)(x+5) = 0

At x=0, 10 a = -4, so a = -0.4
y = (0.4)(x^3 +2x^2 -13x +10) = 0