1/4x-12=x+3

Solution for 1/4x-12=x+3 equation:

1/4x-12=x+3

We move all terms to the left:

1/4x-12-(x+3)=0


Domain of the equation: 4x!=0

x!=0/4

x!=0

x∈R


We get rid of parentheses

1/4x-x-3-12=0

We multiply all the terms by the denominator


-x*4x-3*4x-12*4x+1=0

Wy multiply elements

-4x^2-12x-48x+1=0

We add all the numbers together, and all the variables

-4x^2-60x+1=0

a = -4; b = -60; c = +1;
Δ = b2-4ac
Δ = -602-4·(-4)·1
Δ = 3616
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:

$\sqrt{\Delta}=\sqrt{3616}=\sqrt{16*226}=\sqrt{16}*\sqrt{226}=4\sqrt{226}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-60)-4\sqrt{226}}{2*-4}=\frac{60-4\sqrt{226}}{-8}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-60)+4\sqrt{226}}{2*-4}=\frac{60+4\sqrt{226}}{-8}
$