Question

Which is a factor of 4x^2y + 24x^2 - 24y - 144?

a. 3
b. y + 4
c. x^2 - 4
d. y + 6

Answer 1

= 4(x^2y + 6x^2 - 6y - 36)
= 4(y(x^2 - 6) + 6(x^2 - 6))
= 4(x^2-6)"(y + 6)"

D