x+2x+2/x+15=90

Solution for x+2x+2/x+15=90 equation:

x+2x+2/x+15=90

We move all terms to the left:

x+2x+2/x+15-(90)=0


Domain of the equation: x!=0

x∈R


We add all the numbers together, and all the variables

3x+2/x-75=0

We multiply all the terms by the denominator


3x*x-75*x+2=0

We add all the numbers together, and all the variables

-75x+3x*x+2=0

Wy multiply elements

3x^2-75x+2=0

a = 3; b = -75; c = +2;
Δ = b2-4ac
Δ = -752-4·3·2
Δ = 5601
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{-(-75)-\sqrt{5601}}{2*3}=\frac{75-\sqrt{5601}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-75)+\sqrt{5601}}{2*3}=\frac{75+\sqrt{5601}}{6}
$