Bonjour,
x-3+(2x-9)²-(2x-3)(6-2x) = x-3+(4x²-36x+81)-(12x-4x²-18+6x)
= 4x²+4x²+x-36x-12x-6x-3+81+18
= 8x²-53x+96
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Bonjour,
x-3+(2x-9)²-(2x-3)(6-2x) = x-3+(4x²-36x+81)-(12x-4x²-18+6x)
= 4x²+4x²+x-36x-12x-6x-3+81+18
= 8x²-53x+96