Решите уравнение 10x2 - 17x + 34 = 7x2 - 26x +28

Question

Решите уравнение 10x2 - 17x + 34 = 7x2 - 26x +28

Answer 1

10х2-17х+34-7х2+26х-28
3х2+9х+6=0
Д=81-4*3*6=9
х1=-9-3/6=-2
х2=-9+3/6=-1

Answer 2

10x2-17x+34=7x2-26x+28
10x2-17x+34-7x2+26x-28=0
3x2+9x+6=0 | :3
x2+3x+2=0
За Т.Виета
x1 x x2 =2
x1 + x2 = -3
x1 = -2
x2 = -1