bonjour
J = (x + 7) (5x - 1) - (x + 7) x(x+7)(5x-1-x)
(x+7)(4x-1)
(-5+7)(4*-5-1)
(+2)(-20-1)
2(-21)
-42
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bonjour
J = (x + 7) (5x - 1) - (x + 7) x
(x+7)(5x-1-x)
(x+7)(4x-1)
(x+7)(4x-1)
(-5+7)(4*-5-1)
(+2)(-20-1)
2(-21)
-42
Factoriser l'expression
J= (x+7)(5x-1-x)
J= (x+7)(4x-1)
Calculer J pour x=-5
J= (-5+7)(-20-1)
J= 2(-21)
J= -42