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(a-b)²=a²-2*a*b+b²
(x-4)²=x²-2*4*x+4²=x²-8x+16
Mozna skorzystac z innego wzoru w tym rozwiazaniu:
a²-b²=(a-b)*(a+b)
(x-4)²-36=0
(x-4)²-6²=0
(x-4-6)(x-4+6)=0
(x-10)(x+2)=0
x=10 v x=-2