n2-n-64=0

Solution for n2-n-64=0 equation:

n2-n-64=0

We add all the numbers together, and all the variables

n^2-1n-64=0

a = 1; b = -1; c = -64;
Δ = b2-4ac
Δ = -12-4·1·(-64)
Δ = 257
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1)-\sqrt{257}}{2*1}=\frac{1-\sqrt{257}}{2}
$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+\sqrt{257}}{2*1}=\frac{1+\sqrt{257}}{2}
$