Answer
$x=-4,8$
Work Step by Step
As per given question: $(x-6)(x+2)=20$
This can be written as: $x^2+2x-6x-12-20=0$
or, $x^2-4x-32=0$
Need to use factorization to solve the quadratic equation .
$x^2+4x-8x-32=0$
or, $(x+4)(x-8)=0$
This implies $x+4=0$ and $x-8=0$
Hence, $x=-4,8$
