2x+15=90+1/2x

Solution for 2x+15=90+1/2x equation:

2x+15=90+1/2x

We move all terms to the left:

2x+15-(90+1/2x)=0


Domain of the equation: 2x)!=0

x!=0/1

x!=0

x∈R


We add all the numbers together, and all the variables

2x-(1/2x+90)+15=0

We get rid of parentheses

2x-1/2x-90+15=0

We multiply all the terms by the denominator


2x*2x-90*2x+15*2x-1=0

Wy multiply elements

4x^2-180x+30x-1=0

We add all the numbers together, and all the variables

4x^2-150x-1=0

a = 4; b = -150; c = -1;
Δ = b2-4ac
Δ = -1502-4·4·(-1)
Δ = 22516
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:

$\sqrt{\Delta}=\sqrt{22516}=\sqrt{4*5629}=\sqrt{4}*\sqrt{5629}=2\sqrt{5629}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-150)-2\sqrt{5629}}{2*4}=\frac{150-2\sqrt{5629}}{8}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-150)+2\sqrt{5629}}{2*4}=\frac{150+2\sqrt{5629}}{8}
$