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Sagot :

L= (3x-2)(5x-1) -(3x-5)(5x-1)
1) Factoriser l'expression L
L=(5x-1)(3x-2-3x+5)
=3(5x-1)

2) Calculer l'expression L pour x=2

L(2)=27
L= (5x-1) * [(3x-2)-(3x-5)]
L= 3(5x-1)

pour x=2
L=3*(5*2-1)
L= 27

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