n+(1/2n)=90

Solution for n+(1/2n)=90 equation:

n+(1/2n)=90

We move all terms to the left:

n+(1/2n)-(90)=0


Domain of the equation: 2n)!=0

n!=0/1

n!=0

n∈R


We add all the numbers together, and all the variables

n+(+1/2n)-90=0

We get rid of parentheses

n+1/2n-90=0

We multiply all the terms by the denominator


n*2n-90*2n+1=0

Wy multiply elements

2n^2-180n+1=0

a = 2; b = -180; c = +1;
Δ = b2-4ac
Δ = -1802-4·2·1
Δ = 32392
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{32392}=\sqrt{4*8098}=\sqrt{4}*\sqrt{8098}=2\sqrt{8098}$
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-180)-2\sqrt{8098}}{2*2}=\frac{180-2\sqrt{8098}}{4}
$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-180)+2\sqrt{8098}}{2*2}=\frac{180+2\sqrt{8098}}{4}
$