c^2+4c-20=180

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Solution for c^2+4c-20=180 equation:


Simplifying
c2 + 4c + -20 = 180

Reorder the terms:
-20 + 4c + c2 = 180

Solving
-20 + 4c + c2 = 180

Solving for variable 'c'.

Reorder the terms:
-20 + -180 + 4c + c2 = 180 + -180

Combine like terms: -20 + -180 = -200
-200 + 4c + c2 = 180 + -180

Combine like terms: 180 + -180 = 0
-200 + 4c + c2 = 0

Begin completing the square.

Move the constant term to the right:

Add '200' to each side of the equation.
-200 + 4c + 200 + c2 = 0 + 200

Reorder the terms:
-200 + 200 + 4c + c2 = 0 + 200

Combine like terms: -200 + 200 = 0
0 + 4c + c2 = 0 + 200
4c + c2 = 0 + 200

Combine like terms: 0 + 200 = 200
4c + c2 = 200

The c term is 4c.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4c + 4 + c2 = 200 + 4

Reorder the terms:
4 + 4c + c2 = 200 + 4

Combine like terms: 200 + 4 = 204
4 + 4c + c2 = 204

Factor a perfect square on the left side:
(c + 2)(c + 2) = 204

Calculate the square root of the right side: 14.282856857

Break this problem into two subproblems by setting 
(c + 2) equal to 14.282856857 and -14.282856857.

Subproblem 1

c + 2 = 14.282856857 Simplifying c + 2 = 14.282856857 Reorder the terms: 2 + c = 14.282856857 Solving 2 + c = 14.282856857 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + c = 14.282856857 + -2 Combine like terms: 2 + -2 = 0 0 + c = 14.282856857 + -2 c = 14.282856857 + -2 Combine like terms: 14.282856857 + -2 = 12.282856857 c = 12.282856857 Simplifying c = 12.282856857

Subproblem 2

c + 2 = -14.282856857 Simplifying c + 2 = -14.282856857 Reorder the terms: 2 + c = -14.282856857 Solving 2 + c = -14.282856857 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + c = -14.282856857 + -2 Combine like terms: 2 + -2 = 0 0 + c = -14.282856857 + -2 c = -14.282856857 + -2 Combine like terms: -14.282856857 + -2 = -16.282856857 c = -16.282856857 Simplifying c = -16.282856857

Solution

The solution to the problem is based on the solutions from the subproblems. c = {12.282856857, -16.282856857}

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