c(c-4)=9

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Solution for c(c-4)=9 equation:


Simplifying
c(c + -4) = 9

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

Solving
-4c + c2 = 9

Solving for variable 'c'.

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

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

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -4c + 9 + c2 = 0 + 9

Reorder the terms:
-9 + 9 + -4c + c2 = 0 + 9

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

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

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 = 9 + 4

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

Combine like terms: 9 + 4 = 13
4 + -4c + c2 = 13

Factor a perfect square on the left side:
(c + -2)(c + -2) = 13

Calculate the square root of the right side: 3.605551275

Break this problem into two subproblems by setting 
(c + -2) equal to 3.605551275 and -3.605551275.

Subproblem 1

c + -2 = 3.605551275 Simplifying c + -2 = 3.605551275 Reorder the terms: -2 + c = 3.605551275 Solving -2 + c = 3.605551275 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 = 3.605551275 + 2 Combine like terms: -2 + 2 = 0 0 + c = 3.605551275 + 2 c = 3.605551275 + 2 Combine like terms: 3.605551275 + 2 = 5.605551275 c = 5.605551275 Simplifying c = 5.605551275

Subproblem 2

c + -2 = -3.605551275 Simplifying c + -2 = -3.605551275 Reorder the terms: -2 + c = -3.605551275 Solving -2 + c = -3.605551275 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 = -3.605551275 + 2 Combine like terms: -2 + 2 = 0 0 + c = -3.605551275 + 2 c = -3.605551275 + 2 Combine like terms: -3.605551275 + 2 = -1.605551275 c = -1.605551275 Simplifying c = -1.605551275

Solution

The solution to the problem is based on the solutions from the subproblems. c = {5.605551275, -1.605551275}

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