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c+7=5c(3+4c)
We move all terms to the left:
c+7-(5c(3+4c))=0
We add all the numbers together, and all the variables
c-(5c(4c+3))+7=0
We calculate terms in parentheses: -(5c(4c+3)), so:We get rid of parentheses
5c(4c+3)
We multiply parentheses
20c^2+15c
Back to the equation:
-(20c^2+15c)
-20c^2+c-15c+7=0
We add all the numbers together, and all the variables
-20c^2-14c+7=0
a = -20; b = -14; c = +7;
Δ = b2-4ac
Δ = -142-4·(-20)·7
Δ = 756
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}$$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{756}=\sqrt{36*21}=\sqrt{36}*\sqrt{21}=6\sqrt{21}$$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-14)-6\sqrt{21}}{2*-20}=\frac{14-6\sqrt{21}}{-40} $$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-14)+6\sqrt{21}}{2*-20}=\frac{14+6\sqrt{21}}{-40} $
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