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1/4n-15=2n-1
We move all terms to the left:
1/4n-15-(2n-1)=0
Domain of the equation: 4n!=0We get rid of parentheses
n!=0/4
n!=0
n∈R
1/4n-2n+1-15=0
We multiply all the terms by the denominator
-2n*4n+1*4n-15*4n+1=0
Wy multiply elements
-8n^2+4n-60n+1=0
We add all the numbers together, and all the variables
-8n^2-56n+1=0
a = -8; b = -56; c = +1;
Δ = b2-4ac
Δ = -562-4·(-8)·1
Δ = 3168
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}$$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{3168}=\sqrt{144*22}=\sqrt{144}*\sqrt{22}=12\sqrt{22}$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-56)-12\sqrt{22}}{2*-8}=\frac{56-12\sqrt{22}}{-16} $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-56)+12\sqrt{22}}{2*-8}=\frac{56+12\sqrt{22}}{-16} $
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