Решите уравнения: а) (2x + 1)(x – 3) = –6; б) (x + 3)2 – 5x(x – 2) = 10 ∙ (2x + 1); в) –2x(x – 1) = 5.
2x^2-5x+3=0 d=25-24=1 x1=1 x2=3/2 b) 5x^2-12x+24=0 d=144-80=64=8 x1=2/5 x2=2 v) ne imeet resheniya d<0