C trop donc je vais écrire les réponses seulement :)
A. = (8x+3)[(2x-6)+(x+7)]
= (8x+3)(2x-6+x+7)
= (8x+3)(3x+1)
B. = (7x-6)[x-(7x-6)]
= (7x-6)(x-7x+6)
= (7x-6)(-6x+6)
D. = (5x+2)[6-(x+8)]
= (5x+2)(6-x-8)
= (5x+2)(-x-2)
= - (5x+2)(x+2)
E. = x^2 - 12^2
= (x-12)(x+12)
G. = (3x+1)^2 - 4^2
= [(3x+1)-4] [(3x+1)+4]
= (3x-3)(3x+5)
H. = (2x+3)^2 - (5x+6)^2
= [(2x+3)-(5x+6)][(2x+3)+(5x+6)]
= (-3x-3)(7x+9)
= - (3x+3)(7x+9)
I. = (5x-9)^2 - (3x-7)^2
= [(5x-9)-(3x-7)][(5x-9)+(3x-7)]
= (2x-2)(8x-16)
J'espère que ça t'as aidé : ]
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C trop donc je vais écrire les réponses seulement :)
A. = (8x+3)[(2x-6)+(x+7)]
= (8x+3)(2x-6+x+7)
= (8x+3)(3x+1)
B. = (7x-6)[x-(7x-6)]
= (7x-6)(x-7x+6)
= (7x-6)(-6x+6)
D. = (5x+2)[6-(x+8)]
= (5x+2)(6-x-8)
= (5x+2)(-x-2)
= - (5x+2)(x+2)
E. = x^2 - 12^2
= (x-12)(x+12)
G. = (3x+1)^2 - 4^2
= [(3x+1)-4] [(3x+1)+4]
= (3x-3)(3x+5)
H. = (2x+3)^2 - (5x+6)^2
= [(2x+3)-(5x+6)][(2x+3)+(5x+6)]
= (-3x-3)(7x+9)
= - (3x+3)(7x+9)
I. = (5x-9)^2 - (3x-7)^2
= [(5x-9)-(3x-7)][(5x-9)+(3x-7)]
= (2x-2)(8x-16)
J'espère que ça t'as aidé : ]