Question

I'm stuck; X^2 - 4X -12=0 ?

Answer 1

x^2 = (x )(x )
we know the last term is negative so
multiplying + and - will give us a negative
so (x - )(x + )

we need multiples of 12 the last term
we get 1,2,3,4,6,12

we have to see the combination of these multiples that will give us
-4x

how about
-6 + 2 = -4

and then
we have (x - 6)(x+2)

practice these a lot !!!!