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(3x-1)² -(x-1)²
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Răspuns :

9x^2-6x+1-(x^2-2x+1) = 9x^2-6x+1-x^2+2x-1 = 8x^2-4x =0
4x(2x-1)=0
=> x=0 sau 2x-1=0 => 2x=1 iar x=1/2
(3x-1)² -(x-1)² = (9x²-6x+2)-(x²-2x+1)
                      9x²-6x+2-x²+2x-1=8x²-4x-1