c(c-5)=2(c-5)+c

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Solution for c(c-5)=2(c-5)+c equation:


Simplifying
c(c + -5) = 2(c + -5) + c

Reorder the terms:
c(-5 + c) = 2(c + -5) + c
(-5 * c + c * c) = 2(c + -5) + c
(-5c + c2) = 2(c + -5) + c

Reorder the terms:
-5c + c2 = 2(-5 + c) + c
-5c + c2 = (-5 * 2 + c * 2) + c
-5c + c2 = (-10 + 2c) + c

Combine like terms: 2c + c = 3c
-5c + c2 = -10 + 3c

Solving
-5c + c2 = -10 + 3c

Solving for variable 'c'.

Reorder the terms:
10 + -5c + -3c + c2 = -10 + 3c + 10 + -3c

Combine like terms: -5c + -3c = -8c
10 + -8c + c2 = -10 + 3c + 10 + -3c

Reorder the terms:
10 + -8c + c2 = -10 + 10 + 3c + -3c

Combine like terms: -10 + 10 = 0
10 + -8c + c2 = 0 + 3c + -3c
10 + -8c + c2 = 3c + -3c

Combine like terms: 3c + -3c = 0
10 + -8c + c2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-10' to each side of the equation.
10 + -8c + -10 + c2 = 0 + -10

Reorder the terms:
10 + -10 + -8c + c2 = 0 + -10

Combine like terms: 10 + -10 = 0
0 + -8c + c2 = 0 + -10
-8c + c2 = 0 + -10

Combine like terms: 0 + -10 = -10
-8c + c2 = -10

The c term is -8c.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8c + 16 + c2 = -10 + 16

Reorder the terms:
16 + -8c + c2 = -10 + 16

Combine like terms: -10 + 16 = 6
16 + -8c + c2 = 6

Factor a perfect square on the left side:
(c + -4)(c + -4) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(c + -4) equal to 2.449489743 and -2.449489743.

Subproblem 1

c + -4 = 2.449489743 Simplifying c + -4 = 2.449489743 Reorder the terms: -4 + c = 2.449489743 Solving -4 + c = 2.449489743 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + c = 2.449489743 + 4 Combine like terms: -4 + 4 = 0 0 + c = 2.449489743 + 4 c = 2.449489743 + 4 Combine like terms: 2.449489743 + 4 = 6.449489743 c = 6.449489743 Simplifying c = 6.449489743

Subproblem 2

c + -4 = -2.449489743 Simplifying c + -4 = -2.449489743 Reorder the terms: -4 + c = -2.449489743 Solving -4 + c = -2.449489743 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + c = -2.449489743 + 4 Combine like terms: -4 + 4 = 0 0 + c = -2.449489743 + 4 c = -2.449489743 + 4 Combine like terms: -2.449489743 + 4 = 1.550510257 c = 1.550510257 Simplifying c = 1.550510257

Solution

The solution to the problem is based on the solutions from the subproblems. c = {6.449489743, 1.550510257}

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