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Sagot :

Bonsoir ,



1/ x = -2
x-4 = -2-4 = -6
x^2 = (-6)^2 = 36
x-16 = 36-16 = 20


2/ (x-4)^2 - 16 = (x-4)^2 -4^2

= (x-4-4) (x-4+4) (identité remarquable)
= (x-8) x

= x(x-8)


3/ pour x = 6
Le programme renvoie 6(6-8) = 6(-2) = -12



Bonne soirée

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