(c+3)-c(c-4)=9c-16

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Solution for (c+3)-c(c-4)=9c-16 equation:


Simplifying
(c + 3) + -1c(c + -4) = 9c + -16

Reorder the terms:
(3 + c) + -1c(c + -4) = 9c + -16

Remove parenthesis around (3 + c)
3 + c + -1c(c + -4) = 9c + -16

Reorder the terms:
3 + c + -1c(-4 + c) = 9c + -16
3 + c + (-4 * -1c + c * -1c) = 9c + -16
3 + c + (4c + -1c2) = 9c + -16

Combine like terms: c + 4c = 5c
3 + 5c + -1c2 = 9c + -16

Reorder the terms:
3 + 5c + -1c2 = -16 + 9c

Solving
3 + 5c + -1c2 = -16 + 9c

Solving for variable 'c'.

Reorder the terms:
3 + 16 + 5c + -9c + -1c2 = -16 + 9c + 16 + -9c

Combine like terms: 3 + 16 = 19
19 + 5c + -9c + -1c2 = -16 + 9c + 16 + -9c

Combine like terms: 5c + -9c = -4c
19 + -4c + -1c2 = -16 + 9c + 16 + -9c

Reorder the terms:
19 + -4c + -1c2 = -16 + 16 + 9c + -9c

Combine like terms: -16 + 16 = 0
19 + -4c + -1c2 = 0 + 9c + -9c
19 + -4c + -1c2 = 9c + -9c

Combine like terms: 9c + -9c = 0
19 + -4c + -1c2 = 0

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

Divide each side by '-1'.
-19 + 4c + c2 = 0

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + 4c + 19 + c2 = 0 + 19

Reorder the terms:
-19 + 19 + 4c + c2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + 4c + c2 = 0 + 19
4c + c2 = 0 + 19

Combine like terms: 0 + 19 = 19
4c + c2 = 19

The c term is 4c.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4c + 4 + c2 = 19 + 4

Reorder the terms:
4 + 4c + c2 = 19 + 4

Combine like terms: 19 + 4 = 23
4 + 4c + c2 = 23

Factor a perfect square on the left side:
(c + 2)(c + 2) = 23

Calculate the square root of the right side: 4.795831523

Break this problem into two subproblems by setting 
(c + 2) equal to 4.795831523 and -4.795831523.

Subproblem 1

c + 2 = 4.795831523 Simplifying c + 2 = 4.795831523 Reorder the terms: 2 + c = 4.795831523 Solving 2 + c = 4.795831523 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + c = 4.795831523 + -2 Combine like terms: 2 + -2 = 0 0 + c = 4.795831523 + -2 c = 4.795831523 + -2 Combine like terms: 4.795831523 + -2 = 2.795831523 c = 2.795831523 Simplifying c = 2.795831523

Subproblem 2

c + 2 = -4.795831523 Simplifying c + 2 = -4.795831523 Reorder the terms: 2 + c = -4.795831523 Solving 2 + c = -4.795831523 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + c = -4.795831523 + -2 Combine like terms: 2 + -2 = 0 0 + c = -4.795831523 + -2 c = -4.795831523 + -2 Combine like terms: -4.795831523 + -2 = -6.795831523 c = -6.795831523 Simplifying c = -6.795831523

Solution

The solution to the problem is based on the solutions from the subproblems. c = {2.795831523, -6.795831523}

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