8/x+1=x-1

Solution for 8/x+1=x-1 equation:

8/x+1=x-1

We move all terms to the left:

8/x+1-(x-1)=0


Domain of the equation: x!=0

x∈R


We get rid of parentheses

8/x-x+1+1=0

We multiply all the terms by the denominator


-x*x+1*x+1*x+8=0

We add all the numbers together, and all the variables

2x-x*x+8=0

Wy multiply elements

-1x^2+2x+8=0

a = -1; b = 2; c = +8;
Δ = b2-4ac
Δ = 22-4·(-1)·8
Δ = 36
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{36}=6$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-6}{2*-1}=\frac{-8}{-2}
=+4
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+6}{2*-1}=\frac{4}{-2}
=-2
$