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5/8*n=16
We move all terms to the left:
5/8*n-(16)=0
Domain of the equation: 8*n!=0We multiply all the terms by the denominator
n!=0/1
n!=0
n∈R
-16*8*n+5=0
Wy multiply elements
-128n*n+5=0
Wy multiply elements
-128n^2+5=0
a = -128; b = 0; c = +5;
Δ = b2-4ac
Δ = 02-4·(-128)·5
Δ = 2560
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}$$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{2560}=\sqrt{256*10}=\sqrt{256}*\sqrt{10}=16\sqrt{10}$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-16\sqrt{10}}{2*-128}=\frac{0-16\sqrt{10}}{-256} =-\frac{16\sqrt{10}}{-256} =-\frac{\sqrt{10}}{-16} $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+16\sqrt{10}}{2*-128}=\frac{0+16\sqrt{10}}{-256} =\frac{16\sqrt{10}}{-256} =\frac{\sqrt{10}}{-16} $
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