4(2n+-3)*n=5

Solution for 4(2n+-3)*n=5 equation:

4(2n+-3)*n=5

We move all terms to the left:

4(2n+-3)*n-(5)=0

We add all the numbers together, and all the variables

4(2n-3)*n-5=0

We multiply parentheses

8n^2-12n-5=0

a = 8; b = -12; c = -5;
Δ = b2-4ac
Δ = -122-4·8·(-5)
Δ = 304
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:

$\sqrt{\Delta}=\sqrt{304}=\sqrt{16*19}=\sqrt{16}*\sqrt{19}=4\sqrt{19}$
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-12)-4\sqrt{19}}{2*8}=\frac{12-4\sqrt{19}}{16}
$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-12)+4\sqrt{19}}{2*8}=\frac{12+4\sqrt{19}}{16}
$