c^2+18c+82=0

Solution for c^2+18c+82=0 equation:

Simplifying
c2 + 18c + 82 = 0

Reorder the terms:
82 + 18c + c2 = 0

Solving
82 + 18c + c2 = 0

Solving for variable 'c'.

Begin completing the square.

Move the constant term to the right:

Add '-82' to each side of the equation.
82 + 18c + -82 + c2 = 0 + -82

Reorder the terms:
82 + -82 + 18c + c2 = 0 + -82

Combine like terms: 82 + -82 = 0
0 + 18c + c2 = 0 + -82
18c + c2 = 0 + -82

Combine like terms: 0 + -82 = -82
18c + c2 = -82

The c term is 18c.  Take half its coefficient (9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
18c + 81 + c2 = -82 + 81

Reorder the terms:
81 + 18c + c2 = -82 + 81

Combine like terms: -82 + 81 = -1
81 + 18c + c2 = -1

Factor a perfect square on the left side:
(c + 9)(c + 9) = -1

Can't calculate square root of the right side.

The solution to this equation could not be determined.