Решить уравнение: 10х^2 +5 = 0 25-100x = 0 2x^2 - 8 = 0

10x^2+5=0
10x^2=-5
x^2=10:(-5)
x^2=-2
нет корней

25-100х=0                      2х^2-8=0
-100х=-25                       2х^2=8
х=-25/(-100)                    х^2=8/2
х=0,25                             х^2=4    х1=2,х2=-2