Bonsoir,
Factorisiez ces expressions :
A= (3x+7) (5-x)-(10-2x) (x+7)= (3x+7) (5-x) - 2(5-x) (x+7)=(5-x)(3x+7-2(x+7) )
= (5-x)(3x+7-2x-14)= (5-x)(x-7)= -(x-5)(x-7)
B= (5x^2+7) (x-3)-(x-3)= (x-3)(5x²+7-1)= (x-3)(5x²+6)
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Bonsoir,
Factorisiez ces expressions :
A= (3x+7) (5-x)-(10-2x) (x+7)= (3x+7) (5-x) - 2(5-x) (x+7)=(5-x)(3x+7-2(x+7) )
= (5-x)(3x+7-2x-14)= (5-x)(x-7)= -(x-5)(x-7)
B= (5x^2+7) (x-3)-(x-3)= (x-3)(5x²+7-1)= (x-3)(5x²+6)