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Simplifying
4c2 + -15 = 81
Reorder the terms:
-15 + 4c2 = 81
Solving
-15 + 4c2 = 81
Solving for variable 'c'.
Move all terms containing c to the left, all other terms to the right.
Add '15' to each side of the equation.
-15 + 15 + 4c2 = 81 + 15
Combine like terms: -15 + 15 = 0
0 + 4c2 = 81 + 15
4c2 = 81 + 15
Combine like terms: 81 + 15 = 96
4c2 = 96
Divide each side by '4'.
c2 = 24
Simplifying
c2 = 24
Take the square root of each side:
c = {-4.898979486, 4.898979486}
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