Quadratic formula 9x²-6x-11=0

9x² - 6x - 11 = 0

x = - (-6) + / - √ ((-6) ² - 4 (9) (-11))

2 (9)

x = 6 + / - √ (36 + 396)

18

x = 6 + / - √ (432)

18

x = 6 + / - 20.785

18

x = 6 + 20.785 ∨ x = 6 - 20.785

18 18

x = 26.785 ∨ x = - 14.785

18 18

x = 1.488056 ∨ x = - 0.821389