4n^2-23=4n

Solution for 4n^2-23=4n equation:

4n^2-23=4n

We move all terms to the left:

4n^2-23-(4n)=0

a = 4; b = -4; c = -23;
Δ = b2-4ac
Δ = -42-4·4·(-23)
Δ = 384
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:

$\sqrt{\Delta}=\sqrt{384}=\sqrt{64*6}=\sqrt{64}*\sqrt{6}=8\sqrt{6}$
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-4)-8\sqrt{6}}{2*4}=\frac{4-8\sqrt{6}}{8}
$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-4)+8\sqrt{6}}{2*4}=\frac{4+8\sqrt{6}}{8}
$