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-10=2n+14/3n
We move all terms to the left:
-10-(2n+14/3n)=0
Domain of the equation: 3n)!=0We add all the numbers together, and all the variables
n!=0/1
n!=0
n∈R
-(+2n+14/3n)-10=0
We get rid of parentheses
-2n-14/3n-10=0
We multiply all the terms by the denominator
-2n*3n-10*3n-14=0
Wy multiply elements
-6n^2-30n-14=0
a = -6; b = -30; c = -14;
Δ = b2-4ac
Δ = -302-4·(-6)·(-14)
Δ = 564
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}$$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{564}=\sqrt{4*141}=\sqrt{4}*\sqrt{141}=2\sqrt{141}$$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-30)-2\sqrt{141}}{2*-6}=\frac{30-2\sqrt{141}}{-12} $$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+2\sqrt{141}}{2*-6}=\frac{30+2\sqrt{141}}{-12} $
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