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\left(x+2\right)\left(x-4\right)=\left(x-2\right)\left(x-2\right)+x+2
Variable x cannot be equal to any of the values -2,2 since division by zero is not defined. Multiply both sides of the equation by \left(x-2\right)\left(x+2\right), the least common multiple of x-2,x+2.
\left(x+2\right)\left(x-4\right)=\left(x-2\right)^{2}+x+2
Multiply x-2 and x-2 to get \left(x-2\right)^{2}.
x^{2}-2x-8=\left(x-2\right)^{2}+x+2
Use the distributive property to multiply x+2 by x-4 and combine like terms.
x^{2}-2x-8=x^{2}-4x+4+x+2
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x-2\right)^{2}.
x^{2}-2x-8=x^{2}-3x+4+2
Combine -4x and x to get -3x.
x^{2}-2x-8=x^{2}-3x+6
Add 4 and 2 to get 6.
x^{2}-2x-8-x^{2}=-3x+6
Subtract x^{2} from both sides.
-2x-8=-3x+6
Combine x^{2} and -x^{2} to get 0.
-2x-8+3x=6
Add 3x to both sides.
x-8=6
Combine -2x and 3x to get x.
x=6+8
Add 8 to both sides.
x=14
Add 6 and 8 to get 14.