c^2+c-4=0

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


Simplifying
c2 + c + -4 = 0

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

Solving
-4 + c + c2 = 0

Solving for variable 'c'.

Begin completing the square.

Move the constant term to the right:

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

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

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

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

The c term is c.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
c + 0.25 + c2 = 4 + 0.25

Reorder the terms:
0.25 + c + c2 = 4 + 0.25

Combine like terms: 4 + 0.25 = 4.25
0.25 + c + c2 = 4.25

Factor a perfect square on the left side:
(c + 0.5)(c + 0.5) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(c + 0.5) equal to 2.061552813 and -2.061552813.

Subproblem 1

c + 0.5 = 2.061552813 Simplifying c + 0.5 = 2.061552813 Reorder the terms: 0.5 + c = 2.061552813 Solving 0.5 + c = 2.061552813 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + c = 2.061552813 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + c = 2.061552813 + -0.5 c = 2.061552813 + -0.5 Combine like terms: 2.061552813 + -0.5 = 1.561552813 c = 1.561552813 Simplifying c = 1.561552813

Subproblem 2

c + 0.5 = -2.061552813 Simplifying c + 0.5 = -2.061552813 Reorder the terms: 0.5 + c = -2.061552813 Solving 0.5 + c = -2.061552813 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + c = -2.061552813 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + c = -2.061552813 + -0.5 c = -2.061552813 + -0.5 Combine like terms: -2.061552813 + -0.5 = -2.561552813 c = -2.561552813 Simplifying c = -2.561552813

Solution

The solution to the problem is based on the solutions from the subproblems. c = {1.561552813, -2.561552813}

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