Решите уравнение 9x-7x-2=0

Question

Решите уравнение 9x-7x-2=0

Answer 1

9х-7х-2=0
2х-2=0
2х=2
х=1

Answer 2

9x^2-7x-2=0
D=49-4(9*(-2)=49+72=121
x1 = (7+11)/18=1
x2 = (7-11)/18 = -4/18 = -2/9
Ответ: x1 = 1; x2 = -2/9

Comments

9 x квадрате