Bonsoir,
(2x+1)²-4 = 4x²+4x+1-4 = 4x²+4x-3
(2x+3)(2x-1) = 4x²-2x+6x-3 = 4x²+4x-3
2(x+3)-2x = 2x+6-2x = 6
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Bonsoir,
(2x+1)²-4 = 4x²+4x+1-4 = 4x²+4x-3
(2x+3)(2x-1) = 4x²-2x+6x-3 = 4x²+4x-3
2(x+3)-2x = 2x+6-2x = 6