Решите уравнения: 2) 3х-5=х 3) 3-5(х+2)=2х 4) х^2-64=0 5) 3х^2+2x-5=0

Question

Решите уравнения:
2) 3х-5=х
3) 3-5(х+2)=2х
4) х^2-64=0
5) 3х^2+2x-5=0

Answer 1

2) 3x - 5 = x
3x - x = 5
2x = 5
x = 2,5
3) 3 - 5x - 10 = 2x
- 5x - 2x = 7
- 7x = 7
7x = - 7
x = - 1
4) x^2 - 64 = 0
x^2 = 64
x = 8
x = - 8

5) 3x^2 + 2x - 5 = 0
D = b^2 - 4ac = 4 + 60 = 64 = 8^2
x1 = ( - 2 + 8) / 6 = 1
x2 = ( - 2 - 8) / 6 = - 10/6 = - 5/3 = - 1  2/3