Question

If the quadratic equation y = ax^2+bx+c, where a,b, and c are constants, has the solution set {-2,4}, which of the following is NOT true?
A) a + b + c = -9
B) a = 8c
C) b = -2a
D) c = 4b

Answer 1

solution set is {-2,4}
x=-2 and x=4 working backward we find the quantities

(x+2)=0 and (x-4) = 0 now lets mult the quantities to get our quadratic

(x+2)(x-4)

use the Foil method