Решите (5х+3)^2 - (3x+1)(5x+3)=0 ^ - степень

(25x^2 + 30x + 9) - (15x^2 + 9x + 5x + 3) = 0
25x^2 + 30x + 9 - 15x^2 - 14x - 3 = 0
10x^2 + 16x + 6 = 0
5x^2 + 8x + 3 = 0
r = 1/2 * b
D(дискриминант) = r^2 - ac
D = 16 - 15 = 1
x1,2 = (-4±1)/5
x1 = -0,6
x2 = -1
ответ: x1 = -0,6; x2 = -1