56-(3c+4)=4(c+7)c

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Solution for 56-(3c+4)=4(c+7)c equation:


Simplifying
56 + -1(3c + 4) = 4(c + 7) * c

Reorder the terms:
56 + -1(4 + 3c) = 4(c + 7) * c
56 + (4 * -1 + 3c * -1) = 4(c + 7) * c
56 + (-4 + -3c) = 4(c + 7) * c

Combine like terms: 56 + -4 = 52
52 + -3c = 4(c + 7) * c

Reorder the terms:
52 + -3c = 4(7 + c) * c

Reorder the terms for easier multiplication:
52 + -3c = 4c(7 + c)
52 + -3c = (7 * 4c + c * 4c)
52 + -3c = (28c + 4c2)

Solving
52 + -3c = 28c + 4c2

Solving for variable 'c'.

Combine like terms: -3c + -28c = -31c
52 + -31c + -4c2 = 28c + 4c2 + -28c + -4c2

Reorder the terms:
52 + -31c + -4c2 = 28c + -28c + 4c2 + -4c2

Combine like terms: 28c + -28c = 0
52 + -31c + -4c2 = 0 + 4c2 + -4c2
52 + -31c + -4c2 = 4c2 + -4c2

Combine like terms: 4c2 + -4c2 = 0
52 + -31c + -4c2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-13 + 7.75c + c2 = 0

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 7.75c + 13 + c2 = 0 + 13

Reorder the terms:
-13 + 13 + 7.75c + c2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 7.75c + c2 = 0 + 13
7.75c + c2 = 0 + 13

Combine like terms: 0 + 13 = 13
7.75c + c2 = 13

The c term is 7.75c.  Take half its coefficient (3.875).
Square it (15.015625) and add it to both sides.

Add '15.015625' to each side of the equation.
7.75c + 15.015625 + c2 = 13 + 15.015625

Reorder the terms:
15.015625 + 7.75c + c2 = 13 + 15.015625

Combine like terms: 13 + 15.015625 = 28.015625
15.015625 + 7.75c + c2 = 28.015625

Factor a perfect square on the left side:
(c + 3.875)(c + 3.875) = 28.015625

Calculate the square root of the right side: 5.29297884

Break this problem into two subproblems by setting 
(c + 3.875) equal to 5.29297884 and -5.29297884.

Subproblem 1

c + 3.875 = 5.29297884 Simplifying c + 3.875 = 5.29297884 Reorder the terms: 3.875 + c = 5.29297884 Solving 3.875 + c = 5.29297884 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-3.875' to each side of the equation. 3.875 + -3.875 + c = 5.29297884 + -3.875 Combine like terms: 3.875 + -3.875 = 0.000 0.000 + c = 5.29297884 + -3.875 c = 5.29297884 + -3.875 Combine like terms: 5.29297884 + -3.875 = 1.41797884 c = 1.41797884 Simplifying c = 1.41797884

Subproblem 2

c + 3.875 = -5.29297884 Simplifying c + 3.875 = -5.29297884 Reorder the terms: 3.875 + c = -5.29297884 Solving 3.875 + c = -5.29297884 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-3.875' to each side of the equation. 3.875 + -3.875 + c = -5.29297884 + -3.875 Combine like terms: 3.875 + -3.875 = 0.000 0.000 + c = -5.29297884 + -3.875 c = -5.29297884 + -3.875 Combine like terms: -5.29297884 + -3.875 = -9.16797884 c = -9.16797884 Simplifying c = -9.16797884

Solution

The solution to the problem is based on the solutions from the subproblems. c = {1.41797884, -9.16797884}

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