résolu

Exercice n°3: Factoriser les expressions suivantes
A = 25y2 + 4y
B = 9(2y + 3) + (2y + 3)(5 - 8y)
C = (t - 2)(5 + 4t) - (6t - 1)(t - 2)
D = x2 - 49

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bonjour,
A= 25xyx2+4xy = 30y+4y= 34y
B= 9x2y+3+2yx5+2yx8y+3x5+3x8y
= 18y+3+10y+16y^2+15+24y= 16y^2+52y+10
C= 5t+4t^2-10-8t-(6t^2-12t-t+2)
=13t+4t^2-10-6t^2+12t+t-2
= 26t-2t^2-8
D= 2x-49

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