Question 56826
(3x)^2 + 2x - 5 = 2

9x^2 + 2x - 7 = 0

D = 4 - 4*9*(-7) = 4 + 252 = 256 = 16*16

x1 = (-2 + 16)/9 = 14/ 9
x2 = (-2 - 16) / 9 = -2