5+1/2x+1/4x=80

Solution for 5+1/2x+1/4x=80 equation:

5+1/2x+1/4x=80

We move all terms to the left:

5+1/2x+1/4x-(80)=0


Domain of the equation: 2x!=0

x!=0/2

x!=0

x∈R



Domain of the equation: 4x!=0

x!=0/4

x!=0

x∈R


We add all the numbers together, and all the variables

1/2x+1/4x-75=0

We calculate fractions


4x/8x^2+2x/8x^2-75=0

We multiply all the terms by the denominator


4x+2x-75*8x^2=0

We add all the numbers together, and all the variables

6x-75*8x^2=0

Wy multiply elements

-600x^2+6x=0

a = -600; b = 6; c = 0;
Δ = b2-4ac
Δ = 62-4·(-600)·0
Δ = 36
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{36}=6$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(6)-6}{2*-600}=\frac{-12}{-1200}
=1/100
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(6)+6}{2*-600}=\frac{0}{-1200}
=0
$