(x+2)^2=4^2+x^2
x^2+4x+4=x^2+16
x^2+4x-x^2=16-4
4x=12
x=3
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(x+2)^2=4^2+x^2
x^2+4x+4=x^2+16
x^2+4x-x^2=16-4
4x=12
x=3