3x-12/x+4=0

Solution for 3x-12/x+4=0 equation:

3x-12/x+4=0


Domain of the equation: x!=0

x∈R


We multiply all the terms by the denominator


3x*x+4*x-12=0

We add all the numbers together, and all the variables

4x+3x*x-12=0

Wy multiply elements

3x^2+4x-12=0

a = 3; b = 4; c = -12;
Δ = b2-4ac
Δ = 42-4·3·(-12)
Δ = 160
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{160}=\sqrt{16*10}=\sqrt{16}*\sqrt{10}=4\sqrt{10}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(4)-4\sqrt{10}}{2*3}=\frac{-4-4\sqrt{10}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(4)+4\sqrt{10}}{2*3}=\frac{-4+4\sqrt{10}}{6}
$