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Sagot :

VINS

bonsoir

(5x+7)*(-7x+9)+(-7x+9)*(4x-4)

= ( - 7 x + 9 ) ( 5 x + 7 + 4 x - 4 )

= ( - 7 x + 9 ) (  9 x + 3  )

= 3 ( - 7 x + 9 ) ( 3 x + 1  )

(-7x +9)(5x +7+4x-4)=(-7x +9)(9x +3)

=3(-7x +9)(3x +1)

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