(6c-4)-(c-3)c=-7

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Solution for (6c-4)-(c-3)c=-7 equation:


Simplifying
(6c + -4) + -1(c + -3) * c = -7

Reorder the terms:
(-4 + 6c) + -1(c + -3) * c = -7

Remove parenthesis around (-4 + 6c)
-4 + 6c + -1(c + -3) * c = -7

Reorder the terms:
-4 + 6c + -1(-3 + c) * c = -7

Reorder the terms for easier multiplication:
-4 + 6c + -1c(-3 + c) = -7
-4 + 6c + (-3 * -1c + c * -1c) = -7
-4 + 6c + (3c + -1c2) = -7

Combine like terms: 6c + 3c = 9c
-4 + 9c + -1c2 = -7

Solving
-4 + 9c + -1c2 = -7

Solving for variable 'c'.

Reorder the terms:
-4 + 7 + 9c + -1c2 = -7 + 7

Combine like terms: -4 + 7 = 3
3 + 9c + -1c2 = -7 + 7

Combine like terms: -7 + 7 = 0
3 + 9c + -1c2 = 0

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

Divide each side by '-1'.
-3 + -9c + c2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -9c + 3 + c2 = 0 + 3

Reorder the terms:
-3 + 3 + -9c + c2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -9c + c2 = 0 + 3
-9c + c2 = 0 + 3

Combine like terms: 0 + 3 = 3
-9c + c2 = 3

The c term is -9c.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9c + 20.25 + c2 = 3 + 20.25

Reorder the terms:
20.25 + -9c + c2 = 3 + 20.25

Combine like terms: 3 + 20.25 = 23.25
20.25 + -9c + c2 = 23.25

Factor a perfect square on the left side:
(c + -4.5)(c + -4.5) = 23.25

Calculate the square root of the right side: 4.82182538

Break this problem into two subproblems by setting 
(c + -4.5) equal to 4.82182538 and -4.82182538.

Subproblem 1

c + -4.5 = 4.82182538 Simplifying c + -4.5 = 4.82182538 Reorder the terms: -4.5 + c = 4.82182538 Solving -4.5 + c = 4.82182538 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + c = 4.82182538 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + c = 4.82182538 + 4.5 c = 4.82182538 + 4.5 Combine like terms: 4.82182538 + 4.5 = 9.32182538 c = 9.32182538 Simplifying c = 9.32182538

Subproblem 2

c + -4.5 = -4.82182538 Simplifying c + -4.5 = -4.82182538 Reorder the terms: -4.5 + c = -4.82182538 Solving -4.5 + c = -4.82182538 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + c = -4.82182538 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + c = -4.82182538 + 4.5 c = -4.82182538 + 4.5 Combine like terms: -4.82182538 + 4.5 = -0.32182538 c = -0.32182538 Simplifying c = -0.32182538

Solution

The solution to the problem is based on the solutions from the subproblems. c = {9.32182538, -0.32182538}

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