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Sagot :

CHLAL

Réponse:

b )

( 5x - 2 ) × ( x + 7 )

5x × x + 5x × 7 - 2x - 2 × 7

5x² + 35x - 2x - 14

rep : 5x² + 33x - 14

c )

3( 4x - 3 ) × ( 5x - 2 )

( 12x - 9 ) × ( 5x - 2 )

60x² - 24x - 45x + 18

rep : 60x² - 69x + 18

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