Question

Factor 3x2 - 15x - 42.

Answer 1

3(x^2 -5x -14)=3(x-7)(x+2)

Answer 2

I came to the same conclusion as jhonny9.

First you need to factor out the 5 and then you look for the x-intercepts. Say you get 0 for A and -B than the factors are (x-A)(x+B). Then put the 5 in front of it.