x-1/x+1=8

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

x-1/x+1=8

We move all terms to the left:

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


Domain of the equation: x!=0

x∈R


We add all the numbers together, and all the variables

x-1/x-7=0

We multiply all the terms by the denominator


x*x-7*x-1=0

We add all the numbers together, and all the variables

-7x+x*x-1=0

Wy multiply elements

x^2-7x-1=0

a = 1; b = -7; c = -1;
Δ = b2-4ac
Δ = -72-4·1·(-1)
Δ = 53
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-7)-\sqrt{53}}{2*1}=\frac{7-\sqrt{53}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7)+\sqrt{53}}{2*1}=\frac{7+\sqrt{53}}{2}
$