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6u-5/6u+9=14
We move all terms to the left:
6u-5/6u+9-(14)=0
Domain of the equation: 6u!=0We add all the numbers together, and all the variables
u!=0/6
u!=0
u∈R
6u-5/6u-5=0
We multiply all the terms by the denominator
6u*6u-5*6u-5=0
Wy multiply elements
36u^2-30u-5=0
a = 36; b = -30; c = -5;
Δ = b2-4ac
Δ = -302-4·36·(-5)
Δ = 1620
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{1620}=\sqrt{324*5}=\sqrt{324}*\sqrt{5}=18\sqrt{5}$$u_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-30)-18\sqrt{5}}{2*36}=\frac{30-18\sqrt{5}}{72} $$u_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-30)+18\sqrt{5}}{2*36}=\frac{30+18\sqrt{5}}{72} $
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