10c^2-21c=14c+6

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Solution for 10c^2-21c=14c+6 equation:


Simplifying
10c2 + -21c = 14c + 6

Reorder the terms:
-21c + 10c2 = 14c + 6

Reorder the terms:
-21c + 10c2 = 6 + 14c

Solving
-21c + 10c2 = 6 + 14c

Solving for variable 'c'.

Reorder the terms:
-6 + -21c + -14c + 10c2 = 6 + 14c + -6 + -14c

Combine like terms: -21c + -14c = -35c
-6 + -35c + 10c2 = 6 + 14c + -6 + -14c

Reorder the terms:
-6 + -35c + 10c2 = 6 + -6 + 14c + -14c

Combine like terms: 6 + -6 = 0
-6 + -35c + 10c2 = 0 + 14c + -14c
-6 + -35c + 10c2 = 14c + -14c

Combine like terms: 14c + -14c = 0
-6 + -35c + 10c2 = 0

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

Divide each side by '10'.
-0.6 + -3.5c + c2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -3.5c + 0.6 + c2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -3.5c + c2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -3.5c + c2 = 0 + 0.6
-3.5c + c2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
-3.5c + c2 = 0.6

The c term is -3.5c.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5c + 3.0625 + c2 = 0.6 + 3.0625

Reorder the terms:
3.0625 + -3.5c + c2 = 0.6 + 3.0625

Combine like terms: 0.6 + 3.0625 = 3.6625
3.0625 + -3.5c + c2 = 3.6625

Factor a perfect square on the left side:
(c + -1.75)(c + -1.75) = 3.6625

Calculate the square root of the right side: 1.913765921

Break this problem into two subproblems by setting 
(c + -1.75) equal to 1.913765921 and -1.913765921.

Subproblem 1

c + -1.75 = 1.913765921 Simplifying c + -1.75 = 1.913765921 Reorder the terms: -1.75 + c = 1.913765921 Solving -1.75 + c = 1.913765921 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + c = 1.913765921 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + c = 1.913765921 + 1.75 c = 1.913765921 + 1.75 Combine like terms: 1.913765921 + 1.75 = 3.663765921 c = 3.663765921 Simplifying c = 3.663765921

Subproblem 2

c + -1.75 = -1.913765921 Simplifying c + -1.75 = -1.913765921 Reorder the terms: -1.75 + c = -1.913765921 Solving -1.75 + c = -1.913765921 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + c = -1.913765921 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + c = -1.913765921 + 1.75 c = -1.913765921 + 1.75 Combine like terms: -1.913765921 + 1.75 = -0.163765921 c = -0.163765921 Simplifying c = -0.163765921

Solution

The solution to the problem is based on the solutions from the subproblems. c = {3.663765921, -0.163765921}

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