16-c^2=4c+2

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Solution for 16-c^2=4c+2 equation:


Simplifying
16 + -1c2 = 4c + 2

Reorder the terms:
16 + -1c2 = 2 + 4c

Solving
16 + -1c2 = 2 + 4c

Solving for variable 'c'.

Reorder the terms:
16 + -2 + -4c + -1c2 = 2 + 4c + -2 + -4c

Combine like terms: 16 + -2 = 14
14 + -4c + -1c2 = 2 + 4c + -2 + -4c

Reorder the terms:
14 + -4c + -1c2 = 2 + -2 + 4c + -4c

Combine like terms: 2 + -2 = 0
14 + -4c + -1c2 = 0 + 4c + -4c
14 + -4c + -1c2 = 4c + -4c

Combine like terms: 4c + -4c = 0
14 + -4c + -1c2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-14 + 4c + c2 = 0

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + 4c + 14 + c2 = 0 + 14

Reorder the terms:
-14 + 14 + 4c + c2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + 4c + c2 = 0 + 14
4c + c2 = 0 + 14

Combine like terms: 0 + 14 = 14
4c + c2 = 14

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 = 14 + 4

Reorder the terms:
4 + 4c + c2 = 14 + 4

Combine like terms: 14 + 4 = 18
4 + 4c + c2 = 18

Factor a perfect square on the left side:
(c + 2)(c + 2) = 18

Calculate the square root of the right side: 4.242640687

Break this problem into two subproblems by setting 
(c + 2) equal to 4.242640687 and -4.242640687.

Subproblem 1

c + 2 = 4.242640687 Simplifying c + 2 = 4.242640687 Reorder the terms: 2 + c = 4.242640687 Solving 2 + c = 4.242640687 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 = 4.242640687 + -2 Combine like terms: 2 + -2 = 0 0 + c = 4.242640687 + -2 c = 4.242640687 + -2 Combine like terms: 4.242640687 + -2 = 2.242640687 c = 2.242640687 Simplifying c = 2.242640687

Subproblem 2

c + 2 = -4.242640687 Simplifying c + 2 = -4.242640687 Reorder the terms: 2 + c = -4.242640687 Solving 2 + c = -4.242640687 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 = -4.242640687 + -2 Combine like terms: 2 + -2 = 0 0 + c = -4.242640687 + -2 c = -4.242640687 + -2 Combine like terms: -4.242640687 + -2 = -6.242640687 c = -6.242640687 Simplifying c = -6.242640687

Solution

The solution to the problem is based on the solutions from the subproblems. c = {2.242640687, -6.242640687}

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