źródło:
(x+3)^2-(4-x)(4+x)=2(x-1)^2+1
x^2+6x+9-16+x^2=2(x^2-2x+1)+1
2x^2+6x-7=2x^2-4x+2+1
2x^2-2x^2+6x+4x=3+7
10x=10/:10
x=1
(x+3)^2-(4-x)(4+x)=2(x-1)^2+1 x^2+6x+9-16+x^2=2(x^2-2x+1)+1 2x^2+6x-7=2x^2-4x+2+1 2x^2-2x^2+6x+4x=3+7 10x=10/:10 x=1