Using the ac method factor the trimonials.

Question

15x^2 + 31x+2=

Answer 1

15x^2 + 31x + 2

A*C = 15*2 = 30 = 1*30. Sum = 1+30=31=B.
15x^2 + (x+30x) + 2
Form 2 factorable binomials:
(15x^2+x) + (30x+2) =
x(15x+1) + 2(15x+1) =
(15x+1)(x+2).