Bonjour pouvez-vous me corriger svp A= 12^2+ (4x+5)^2
= 12x^2 + 4x^2+ 2x 4x x 5 + 5^2
= 16x^2 + 40x + 25
B= 7x - (6x+2)^2
= 7x-6x^2+2 x 6x x 2+2^2
= 7x-36x^2+24x+4
= -36x^2+31x +4
= 12x^2 + 4x^2+ 2x 4x x 5 + 5^2
= 16x^2 + 40x + 25
B= 7x - (6x+2)^2
= 7x-6x^2+2 x 6x x 2+2^2
= 7x-36x^2+24x+4
= -36x^2+31x +4
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