-2x-6+(-1/4x)-3=90

Solution for -2x-6+(-1/4x)-3=90 equation:

-2x-6+(-1/4x)-3=90

We move all terms to the left:

-2x-6+(-1/4x)-3-(90)=0


Domain of the equation: 4x)!=0

x!=0/1

x!=0

x∈R


We add all the numbers together, and all the variables

-2x+(-1/4x)-99=0

We get rid of parentheses

-2x-1/4x-99=0

We multiply all the terms by the denominator


-2x*4x-99*4x-1=0

Wy multiply elements

-8x^2-396x-1=0

a = -8; b = -396; c = -1;
Δ = b2-4ac
Δ = -3962-4·(-8)·(-1)
Δ = 156784
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:

$\sqrt{\Delta}=\sqrt{156784}=\sqrt{16*9799}=\sqrt{16}*\sqrt{9799}=4\sqrt{9799}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-396)-4\sqrt{9799}}{2*-8}=\frac{396-4\sqrt{9799}}{-16}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-396)+4\sqrt{9799}}{2*-8}=\frac{396+4\sqrt{9799}}{-16}
$