bonjour

exercice 6 )))

exercice 7 ))))

x² -6x + 9 = x ² - 2×x×3 + 3² = (x-3)²

x² + 10 x + 25 = x² + 2 ×5×x + 5² = (x+5)²

x²-81 = x² - 9² = (x-9)(x+9)

exercice 8 )))

49x² - 36 = (7x)² - 6² =( 7x+6)(7x-6)

exercice 9))))

calculer pour x = - 2

-12×-2 - 18 + 6 × (-2)²

= 24 - 18 + 24 = 30

Factoriser

(2x-6)(7+3x-4) = (2x-6)(3+3x) = 2(x-3)3(1+x) = 6(x-3)(1+x)

bonne continuation