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Sagot :

Bonjour,

10-3x(4x+1) = 10-12x²-3x

(x+2)(x-2)-(x+3) = x²-2²-x-3 = x²-x-7

(8-x)-(2x+4) = 8-x-2x-4 = 4-3x

(-5 × 3x)(x ×4) = (-15x)(4x) = -60x²

(2x+2)² = 4x²+8x+4

(2x-3)(5x-6)+8 = 10x²-12x-15x+18+8 = 10x²-27x+26

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