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x²-1=2
x²=1
x=1
x²-1²=2
x²-1=2
x²=2+1
x²=3 /√
x=√3
Pozdrawiam;)
(a+b)(a-b)=a²-b²
(x+1)(x-1)=2
x² – 1² = 2
x² – 1 = 2 /+1
x² = 3 /√
x = √3