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wzor: (a-b)(a+b)=a²-b²
x(x-2)+2x-216=0
x²-2x+2x-216=0
x²-216=0
(x-√216)(x+√216)=0
216=36*6
√216=√36*√6=6√6
Odp. x=√216=6√6 lub x=-6√6.