Question 34177
x^2 - 7x - 12 = 6
=>x^2 - 7x - 18 = 0
=>x^2 - 9x + 2x - 18 = 0
=>x(x-9) + 2(x-9) = 0
=>(x+2)(x-9) = 0
Here there are 2 possibilities ----
1)  x+2 = 0/(x-9)
    x+2 = 0
    x= -2
       
     OR


2)  x-9 = 0/(x+2)
    x-9 = 0
    x = 9 

So the answer can be either x = -2 OR x = 9