4/5x+8=2x

Solution for 4/5x+8=2x equation:

4/5x+8=2x

We move all terms to the left:

4/5x+8-(2x)=0


Domain of the equation: 5x!=0

x!=0/5

x!=0

x∈R


We add all the numbers together, and all the variables

-2x+4/5x+8=0

We multiply all the terms by the denominator


-2x*5x+8*5x+4=0

Wy multiply elements

-10x^2+40x+4=0

a = -10; b = 40; c = +4;
Δ = b2-4ac
Δ = 402-4·(-10)·4
Δ = 1760
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:

$\sqrt{\Delta}=\sqrt{1760}=\sqrt{16*110}=\sqrt{16}*\sqrt{110}=4\sqrt{110}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(40)-4\sqrt{110}}{2*-10}=\frac{-40-4\sqrt{110}}{-20}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(40)+4\sqrt{110}}{2*-10}=\frac{-40+4\sqrt{110}}{-20}
$