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Sagot :

LOULAKAR

Bonjour

Identité remarquable :

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

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

(√3-1)(√3+1)= (V3)^2 - 1^2 = 3 - 1 = 2

(√2+1)^2= (V2)^2 - 2 x V2 x 1 + 1^2 = 2 - 2V2 + 1 = 3 - 2V2

(2√3-4)(2√3+4)= (2V3)^2 - 4^2 = 4 x 3 - 16 = 12 - 16 = (-4)

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