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2/5c+4/5c+2=c+7
We move all terms to the left:
2/5c+4/5c+2-(c+7)=0
Domain of the equation: 5c!=0We get rid of parentheses
c!=0/5
c!=0
c∈R
2/5c+4/5c-c-7+2=0
We multiply all the terms by the denominator
-c*5c-7*5c+2*5c+2+4=0
We add all the numbers together, and all the variables
-c*5c-7*5c+2*5c+6=0
Wy multiply elements
-5c^2-35c+10c+6=0
We add all the numbers together, and all the variables
-5c^2-25c+6=0
a = -5; b = -25; c = +6;
Δ = b2-4ac
Δ = -252-4·(-5)·6
Δ = 745
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-25)-\sqrt{745}}{2*-5}=\frac{25-\sqrt{745}}{-10} $$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-25)+\sqrt{745}}{2*-5}=\frac{25+\sqrt{745}}{-10} $
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