4c^2-9c+36c+81=0

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Solution for 4c^2-9c+36c+81=0 equation:


Simplifying
4c2 + -9c + 36c + 81 = 0

Reorder the terms:
81 + -9c + 36c + 4c2 = 0

Combine like terms: -9c + 36c = 27c
81 + 27c + 4c2 = 0

Solving
81 + 27c + 4c2 = 0

Solving for variable 'c'.

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
20.25 + 6.75c + c2 = 0

Move the constant term to the right:

Add '-20.25' to each side of the equation.
20.25 + 6.75c + -20.25 + c2 = 0 + -20.25

Reorder the terms:
20.25 + -20.25 + 6.75c + c2 = 0 + -20.25

Combine like terms: 20.25 + -20.25 = 0.00
0.00 + 6.75c + c2 = 0 + -20.25
6.75c + c2 = 0 + -20.25

Combine like terms: 0 + -20.25 = -20.25
6.75c + c2 = -20.25

The c term is 6.75c.  Take half its coefficient (3.375).
Square it (11.390625) and add it to both sides.

Add '11.390625' to each side of the equation.
6.75c + 11.390625 + c2 = -20.25 + 11.390625

Reorder the terms:
11.390625 + 6.75c + c2 = -20.25 + 11.390625

Combine like terms: -20.25 + 11.390625 = -8.859375
11.390625 + 6.75c + c2 = -8.859375

Factor a perfect square on the left side:
(c + 3.375)(c + 3.375) = -8.859375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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