5n^2-18-3n=3n

Solution for 5n^2-18-3n=3n equation:

5n^2-18-3n=3n

We move all terms to the left:

5n^2-18-3n-(3n)=0

We add all the numbers together, and all the variables

5n^2-6n-18=0

a = 5; b = -6; c = -18;
Δ = b2-4ac
Δ = -62-4·5·(-18)
Δ = 396
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:

$\sqrt{\Delta}=\sqrt{396}=\sqrt{36*11}=\sqrt{36}*\sqrt{11}=6\sqrt{11}$
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-6\sqrt{11}}{2*5}=\frac{6-6\sqrt{11}}{10}
$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+6\sqrt{11}}{2*5}=\frac{6+6\sqrt{11}}{10}
$