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( 3x - 5) au carré - (3x - 5) (x + 4)

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Grade: Education Subject: mathematiques
Helps me please

( 3x - 5) au carré - (3x - 5) (x + 4)
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salut
(3x-5)^2-(3x-5)(x+4)
9x^2-30x-25-(3x-12+3x^2-20)
9x^2-30x-25-3x+12-3x^2+20
9x^2-3x^2-30x-3x-25+12+20
3x^2-33x+7