7(c+7)c=2

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Solution for 7(c+7)c=2 equation:


Simplifying
7(c + 7) * c = 2

Reorder the terms:
7(7 + c) * c = 2

Reorder the terms for easier multiplication:
7c(7 + c) = 2
(7 * 7c + c * 7c) = 2
(49c + 7c2) = 2

Solving
49c + 7c2 = 2

Solving for variable 'c'.

Reorder the terms:
-2 + 49c + 7c2 = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + 49c + 7c2 = 0

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

Divide each side by '7'.
-0.2857142857 + 7c + c2 = 0

Move the constant term to the right:

Add '0.2857142857' to each side of the equation.
-0.2857142857 + 7c + 0.2857142857 + c2 = 0 + 0.2857142857

Reorder the terms:
-0.2857142857 + 0.2857142857 + 7c + c2 = 0 + 0.2857142857

Combine like terms: -0.2857142857 + 0.2857142857 = 0.0000000000
0.0000000000 + 7c + c2 = 0 + 0.2857142857
7c + c2 = 0 + 0.2857142857

Combine like terms: 0 + 0.2857142857 = 0.2857142857
7c + c2 = 0.2857142857

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 = 0.2857142857 + 12.25

Reorder the terms:
12.25 + 7c + c2 = 0.2857142857 + 12.25

Combine like terms: 0.2857142857 + 12.25 = 12.5357142857
12.25 + 7c + c2 = 12.5357142857

Factor a perfect square on the left side:
(c + 3.5)(c + 3.5) = 12.5357142857

Calculate the square root of the right side: 3.540581066

Break this problem into two subproblems by setting 
(c + 3.5) equal to 3.540581066 and -3.540581066.

Subproblem 1

c + 3.5 = 3.540581066 Simplifying c + 3.5 = 3.540581066 Reorder the terms: 3.5 + c = 3.540581066 Solving 3.5 + c = 3.540581066 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 = 3.540581066 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + c = 3.540581066 + -3.5 c = 3.540581066 + -3.5 Combine like terms: 3.540581066 + -3.5 = 0.040581066 c = 0.040581066 Simplifying c = 0.040581066

Subproblem 2

c + 3.5 = -3.540581066 Simplifying c + 3.5 = -3.540581066 Reorder the terms: 3.5 + c = -3.540581066 Solving 3.5 + c = -3.540581066 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 = -3.540581066 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + c = -3.540581066 + -3.5 c = -3.540581066 + -3.5 Combine like terms: -3.540581066 + -3.5 = -7.040581066 c = -7.040581066 Simplifying c = -7.040581066

Solution

The solution to the problem is based on the solutions from the subproblems. c = {0.040581066, -7.040581066}

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