5n^2+2=10n

Solution for 5n^2+2=10n equation:

5n^2+2=10n

We move all terms to the left:

5n^2+2-(10n)=0

a = 5; b = -10; c = +2;
Δ = b2-4ac
Δ = -102-4·5·2
Δ = 60
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:

$\sqrt{\Delta}=\sqrt{60}=\sqrt{4*15}=\sqrt{4}*\sqrt{15}=2\sqrt{15}$
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-10)-2\sqrt{15}}{2*5}=\frac{10-2\sqrt{15}}{10}
$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-10)+2\sqrt{15}}{2*5}=\frac{10+2\sqrt{15}}{10}
$