7/9c+1/3c=1/10

Solution for 7/9c+1/3c=1/10 equation:

7/9c+1/3c=1/10

We move all terms to the left:

7/9c+1/3c-(1/10)=0


Domain of the equation: 9c!=0

c!=0/9

c!=0

c∈R



Domain of the equation: 3c!=0

c!=0/3

c!=0

c∈R


We add all the numbers together, and all the variables

7/9c+1/3c-(+1/10)=0

We get rid of parentheses

7/9c+1/3c-1/10=0

We calculate fractions


(-81c^2)/270c^2+210c/270c^2+90c/270c^2=0

We multiply all the terms by the denominator


(-81c^2)+210c+90c=0

We add all the numbers together, and all the variables

(-81c^2)+300c=0

We get rid of parentheses

-81c^2+300c=0

a = -81; b = 300; c = 0;
Δ = b2-4ac
Δ = 3002-4·(-81)·0
Δ = 90000
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{90000}=300$
$c_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(300)-300}{2*-81}=\frac{-600}{-162}
=3+19/27
$
$c_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(300)+300}{2*-81}=\frac{0}{-162}
=0
$