Question

помогите пожалуйста

Answer 1

(1)(10x^2+5x) = 0
x(10x+5) = 0
x1 = 0 ; 10x+5 = 0
              x2=-1/2
(2)   x(12x+3) = 0
x1 = 0
x2=-1/4
(3)   5-10x = 0
x=1/2
(4) 2 - 6x =0
6x = 2
x=1/3