Question

Ре­ши­те урав­не­ние -2x^2+x+7=-x^2+5x+(-2-x^2)

Answer 1

- 2 x ^ 2 + x + 7 = - x ^ 2 + 5 x + (-2 - x ^2)
- 2 x ^ 2 + x + x ^ 2 + 5 x - x ^ 2 = - 7 + 5 + 2
- 2 x ^ 2 + x ^ 5 + 5 x = 3
6 x = 3
x = 6 : 3
x = 2