3x-15/x+1=0

Solution for 3x-15/x+1=0 equation:

3x-15/x+1=0


Domain of the equation: x!=0

x∈R


We multiply all the terms by the denominator


3x*x+1*x-15=0

We add all the numbers together, and all the variables

x+3x*x-15=0

Wy multiply elements

3x^2+x-15=0

a = 3; b = 1; c = -15;
Δ = b2-4ac
Δ = 12-4·3·(-15)
Δ = 181
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{-(1)-\sqrt{181}}{2*3}=\frac{-1-\sqrt{181}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{181}}{2*3}=\frac{-1+\sqrt{181}}{6}
$