Question

factor the trinomial completely

x^2+x-42

Answer 1

we want two numbers that add to +1 and multiply to -42. +7 and -6 meet this criteria.

(x+7)(x-6)=x^2+x-42

Answer 2

Two numbers when that add to the 1 when multiplied give you: -42. So you know -6 + 7 = 1. So you have x^2-6x+7x-42
now factor into groups x(x-6) + 7(x-6)
so you're answer is (x-6)(x+7) = x^2+x-42

Answer 3

I realise this is the maths forum, but "so YOUR answer is"