Factoriser : a) (2x+1) (3x+2) + (2x+1) (7x+3) = b) 4x² - 20x + 25 =
Mathématiques
cathystyles13
Question
Factoriser :
a) (2x+1) (3x+2) + (2x+1) (7x+3) =
b) 4x² - 20x + 25 =
a) (2x+1) (3x+2) + (2x+1) (7x+3) =
b) 4x² - 20x + 25 =
1 Réponse
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1. Réponse loulakar
Bonjour,
(2x+1)(3x+2)+(2x+1)(7x+3)= (2x+1)(3x+2+7x+3)=(2x+1)(10x+5) = 2(2x + 1)(2x + 1) = 2(2x + 1)²
4x²-20x+25= (2x)² - 2 * 2x * 5 + (5)² = (2x-5)²