Bonjour
Factoriser :
c : f(x)= 2(x-3)(x+7) - ( 2 x+1)(x+7)
D : f(x)= ( 4-x) (X² + x )
E : f(x)= ( X-2 ) ( X+1 ) - ( x² - 4 )
Merci d'avance !
Factoriser :
c : f(x)= 2(x-3)(x+7) - ( 2 x+1)(x+7)
D : f(x)= ( 4-x) (X² + x )
E : f(x)= ( X-2 ) ( X+1 ) - ( x² - 4 )
Merci d'avance !
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=(x²+x-2x-2)-(x²-2X2Xx+2²)
=(x²-x-2)-(x²-4x+4)
= x²-x-2-x²+4x-4
= 3x-6
=2(x-3)(x+7)-(2x+1)(x+7) =[x+7][2x-6-2x-1] =[x+7][-7]