c^2-7c-2=-4

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Solution for c^2-7c-2=-4 equation:


Simplifying
c2 + -7c + -2 = -4

Reorder the terms:
-2 + -7c + c2 = -4

Solving
-2 + -7c + c2 = -4

Solving for variable 'c'.

Reorder the terms:
-2 + 4 + -7c + c2 = -4 + 4

Combine like terms: -2 + 4 = 2
2 + -7c + c2 = -4 + 4

Combine like terms: -4 + 4 = 0
2 + -7c + c2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -7c + -2 + c2 = 0 + -2

Reorder the terms:
2 + -2 + -7c + c2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -7c + c2 = 0 + -2
-7c + c2 = 0 + -2

Combine like terms: 0 + -2 = -2
-7c + c2 = -2

The c term is -7c.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7c + 12.25 + c2 = -2 + 12.25

Reorder the terms:
12.25 + -7c + c2 = -2 + 12.25

Combine like terms: -2 + 12.25 = 10.25
12.25 + -7c + c2 = 10.25

Factor a perfect square on the left side:
(c + -3.5)(c + -3.5) = 10.25

Calculate the square root of the right side: 3.201562119

Break this problem into two subproblems by setting 
(c + -3.5) equal to 3.201562119 and -3.201562119.

Subproblem 1

c + -3.5 = 3.201562119 Simplifying c + -3.5 = 3.201562119 Reorder the terms: -3.5 + c = 3.201562119 Solving -3.5 + c = 3.201562119 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + c = 3.201562119 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + c = 3.201562119 + 3.5 c = 3.201562119 + 3.5 Combine like terms: 3.201562119 + 3.5 = 6.701562119 c = 6.701562119 Simplifying c = 6.701562119

Subproblem 2

c + -3.5 = -3.201562119 Simplifying c + -3.5 = -3.201562119 Reorder the terms: -3.5 + c = -3.201562119 Solving -3.5 + c = -3.201562119 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + c = -3.201562119 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + c = -3.201562119 + 3.5 c = -3.201562119 + 3.5 Combine like terms: -3.201562119 + 3.5 = 0.298437881 c = 0.298437881 Simplifying c = 0.298437881

Solution

The solution to the problem is based on the solutions from the subproblems. c = {6.701562119, 0.298437881}

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