a.x²-9x-22=0 b.3x²-4x=7 c.x²-x=5

A•
x² - 9x - 22 = 0
(x - 11)(x + 2) = 0
x = 11 atau x = -2

B•
3x² - 4x = 7
3x² - 4x - 7 = 0
(3x - 7)(x + 1) = 0
x = 7/3 atau x = -1

C•
x² - x = 5
x² - x - 5 = 0
x1,2 = (1 ± √21)/2
x1 = (1 + √21)/2
x2 = (1 - √21)/2