Question

Най­ди­те ко­рень урав­не­ния 2x^2-x-1=x^2-5x-(-1-x^2)

Answer 1

2x^2 - x - 1 = x^2 - 5x + 1 + x^2
2x^2 - x- 1 = 2x^2 - 5x + 1
- x - 1 = - 5x + 1
- x + 5x = 2
4x = 2 
x = 2/4 = 1/2 = 0.5