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comment developper (x-1)(x+5)

merci


Répondre :

(x-1)(x+5)
= x*x+x*5-1*x-1*5
= x^2+5x-x-5
=x^2+4x-5
(x-1)(x+5)
= x*x+x*5-1*x-1*5
= x²+5x-x-5
= x²+4x-5