Question

x²-1-5-x=0 помогите.

Answer 1

х² - 1  - 5 - х = 0
х²  - х  - 6  = 0
x  + 2x  - 3x   - 6 =0
x(x+2)  - 3(x+2) = 0
(x - 3)(x  + 2 ) = 0
x - 3 = 0
x₁ = 3
x+2=0
x₂=-2