Verified answer

Bonjour

a. 2x² - 5x = 0

x (2x - 5) = 0

x = 0 ou 2x - 5 = 0

2x = 5

x = 5/2

b. x² + 6x + 9 = 0

(x + 3)² = 0

x + 3 = 0

x = - 3

c. x² - 2x + 1 = 0

(x - 1)² = 0

x - 1 = 0

x = 1

d. 25x² - 9 = 0

(5x - 3) (5x + 3) = 0

5x - 3 = 0 ou 5x + 3 = 0

5x = 3 5x = - 3

x = 3/5 x = - 3/5.