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Sagot :

Bonsoir,

(3x-2)²-(7x+3)(3x-2)

= (3x-2) (3x-2) - (7x+3)(3x-2)

on factorise:

(3x-2) ( (3x-2 - 7x -3)

= (3x-2) ( -4x -5)

S'il faut  développer:

-12x² -15x +8x +10

=  -12x² -7x +10

Bonsoir

Factorisons

(3x-2)²-(7x+3)(3x-2)

-> (3x-2)(3x-2) - (7x+3)(3x-2)

-> (3x-2) [(3x-2)-(7x+3)]

-> (3x-2) (3x-2-7x-3)

-> (3x-2) (-4x-5)

-> -(3x-2)(4x+5)

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