x^2+2xy-15y^2

Question

is this factorable?

Answer 1

well, let's see... +5 * -3 = -15

that help?

Answer 2

still confused

Answer 3

well, how about (x+5y)(x-3y)

You just need two factors of 15 that differ by 2 in value; one added, the other subtracted.