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Sagot :

LOULAKAR

Bonjour


identité remarquable :

(a + b)^2 = a^2 + 2ab + b^2

(a - b)^2 = a^2 - 2ab + b^2

(a - b)(a + b) = a^2 - b^2


developper et réduire :


A = (x + 3)^2

A = x^2 + 6x + 9


B = (x - 5)^2

B = x^2 - 10x + 25


C = (x + 7)(x - 7)

C = x^2 - 49

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