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Simplifying
39c2 + -4 = 21
Reorder the terms:
-4 + 39c2 = 21
Solving
-4 + 39c2 = 21
Solving for variable 'c'.
Move all terms containing c to the left, all other terms to the right.
Add '4' to each side of the equation.
-4 + 4 + 39c2 = 21 + 4
Combine like terms: -4 + 4 = 0
0 + 39c2 = 21 + 4
39c2 = 21 + 4
Combine like terms: 21 + 4 = 25
39c2 = 25
Divide each side by '39'.
c2 = 0.641025641
Simplifying
c2 = 0.641025641
Take the square root of each side:
c = {-0.800640769, 0.800640769}
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