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-2x = -2
x = 1
b) x^2 - 8x + 16 = x^2 - 4
-8x = -20
x = 2,5
c) x^2 + 3(x-1)(x+1) = 1 + (2x-1)^2
x^2 + 3x^2 - 3 = 1 + 4x^2 - 4x + 1
-4x = -6
x = 1,5
x^2 to x do potęgi 2