3x+5/x=9

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Solution for 3x+5/x=9 equation:



3x+5/x=9
We move all terms to the left:
3x+5/x-(9)=0
Domain of the equation: x!=0
x∈R
We multiply all the terms by the denominator
3x*x-9*x+5=0
We add all the numbers together, and all the variables
-9x+3x*x+5=0
Wy multiply elements
3x^2-9x+5=0
a = 3; b = -9; c = +5;
Δ = b2-4ac
Δ = -92-4·3·5
Δ = 21
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{-(-9)-\sqrt{21}}{2*3}=\frac{9-\sqrt{21}}{6} $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+\sqrt{21}}{2*3}=\frac{9+\sqrt{21}}{6} $

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