Bonjour,
Développer :
3(20x+48+3)+25x²
= 60x + 144 + 9 + 25x²
= 25x² + 60x + 153
Factoriser l'expression :
= ( 5x - 3 )² - 144
(5x - 3 - 12) (5x - 3 + 12)
= (5x - 15) (5x + 9)
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Bonjour,
Développer :
3(20x+48+3)+25x²
= 60x + 144 + 9 + 25x²
= 25x² + 60x + 153
Factoriser l'expression :
= ( 5x - 3 )² - 144
(5x - 3 - 12) (5x - 3 + 12)
= (5x - 15) (5x + 9)