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s+3*1/2s+10=55
We move all terms to the left:
s+3*1/2s+10-(55)=0
Domain of the equation: 2s!=0We add all the numbers together, and all the variables
s!=0/2
s!=0
s∈R
s+3*1/2s-45=0
We multiply all the terms by the denominator
s*2s-45*2s+3*1=0
We add all the numbers together, and all the variables
s*2s-45*2s+3=0
Wy multiply elements
2s^2-90s+3=0
a = 2; b = -90; c = +3;
Δ = b2-4ac
Δ = -902-4·2·3
Δ = 8076
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$s_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$s_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{8076}=\sqrt{4*2019}=\sqrt{4}*\sqrt{2019}=2\sqrt{2019}$$s_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-90)-2\sqrt{2019}}{2*2}=\frac{90-2\sqrt{2019}}{4} $$s_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-90)+2\sqrt{2019}}{2*2}=\frac{90+2\sqrt{2019}}{4} $
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