Корень (4x+5) * (3x-2) = 4x+5

Корень (4 х+5) * (3x-2) = 4x+5 | возведем в квадрат обе части уравнения

(4x+5) * (3x-2) = (4x+5) ^2

12x^2-8x+15x-10 = 16x^2+40x+25

12x^2-16x^2-8x-40x+15x-10-25 = 0

-4x^2 - 33x - 35 = 0 | : - 1

4x^2 + 33x + 35 = 0

корень D = b^2-4ac = 1089 - 560 = 529

x1 = (-33 + 23) / 8

x1 = - 10/8

x1 = - 5/4

x2 = (-33 - 23) / 8

x2 = - 7