2r+1/r=3

Solution for 2r+1/r=3 equation:

2r+1/r=3

We move all terms to the left:

2r+1/r-(3)=0


Domain of the equation: r!=0

r∈R


We multiply all the terms by the denominator


2r*r-3*r+1=0

We add all the numbers together, and all the variables

-3r+2r*r+1=0

Wy multiply elements

2r^2-3r+1=0

a = 2; b = -3; c = +1;
Δ = b2-4ac
Δ = -32-4·2·1
Δ = 1
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1}=1$
$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-3)-1}{2*2}=\frac{2}{4}
=1/2
$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+1}{2*2}=\frac{4}{4}
=1
$