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factoriser (9x_7)au carre -16​

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Bonjour

( 9x - 7) ^2 - 16

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

= ( 9x - 11) ( 9x - 3)

= 3 ( 9x - 11) ( 3x - 1)