Question

2(x-2)(x+2)-(x-1)²=x²-5

Answer 1

$2(x-2)(x+2)-(x-1)^2=x^2-5\ 2(x^2-4)-(x^2-2x+1)=x^2-5\ 2x^2-8-x^2+2x-1=x^2-5\ x^2+2x-9=x^2-5\ 2x=9-5\ 2x=4\ x=2$