x-2/x=0.90

Solution for x-2/x=0.90 equation:

x-2/x=0.90

We move all terms to the left:

x-2/x-(0.90)=0


Domain of the equation: x!=0

x∈R


We add all the numbers together, and all the variables

x-2/x-(0.9)=0

We add all the numbers together, and all the variables

x-2/x-0.9=0

We multiply all the terms by the denominator


x*x-(0.9)*x-2=0

We multiply parentheses

x*x-0.9x-2=0

Wy multiply elements

x^2-0.9x-2=0

a = 1; b = -0.9; c = -2;
Δ = b2-4ac
Δ = -0.92-4·1·(-2)
Δ = 8.81
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{-(-0.9)-\sqrt{8.81}}{2*1}=\frac{0.9-\sqrt{8.81}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-0.9)+\sqrt{8.81}}{2*1}=\frac{0.9+\sqrt{8.81}}{2}
$