10(c+9)c=3

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Solution for 10(c+9)c=3 equation:


Simplifying
10(c + 9) * c = 3

Reorder the terms:
10(9 + c) * c = 3

Reorder the terms for easier multiplication:
10c(9 + c) = 3
(9 * 10c + c * 10c) = 3
(90c + 10c2) = 3

Solving
90c + 10c2 = 3

Solving for variable 'c'.

Reorder the terms:
-3 + 90c + 10c2 = 3 + -3

Combine like terms: 3 + -3 = 0
-3 + 90c + 10c2 = 0

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

Divide each side by '10'.
-0.3 + 9c + c2 = 0

Move the constant term to the right:

Add '0.3' to each side of the equation.
-0.3 + 9c + 0.3 + c2 = 0 + 0.3

Reorder the terms:
-0.3 + 0.3 + 9c + c2 = 0 + 0.3

Combine like terms: -0.3 + 0.3 = 0.0
0.0 + 9c + c2 = 0 + 0.3
9c + c2 = 0 + 0.3

Combine like terms: 0 + 0.3 = 0.3
9c + c2 = 0.3

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 = 0.3 + 20.25

Reorder the terms:
20.25 + 9c + c2 = 0.3 + 20.25

Combine like terms: 0.3 + 20.25 = 20.55
20.25 + 9c + c2 = 20.55

Factor a perfect square on the left side:
(c + 4.5)(c + 4.5) = 20.55

Calculate the square root of the right side: 4.533210783

Break this problem into two subproblems by setting 
(c + 4.5) equal to 4.533210783 and -4.533210783.

Subproblem 1

c + 4.5 = 4.533210783 Simplifying c + 4.5 = 4.533210783 Reorder the terms: 4.5 + c = 4.533210783 Solving 4.5 + c = 4.533210783 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 = 4.533210783 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + c = 4.533210783 + -4.5 c = 4.533210783 + -4.5 Combine like terms: 4.533210783 + -4.5 = 0.033210783 c = 0.033210783 Simplifying c = 0.033210783

Subproblem 2

c + 4.5 = -4.533210783 Simplifying c + 4.5 = -4.533210783 Reorder the terms: 4.5 + c = -4.533210783 Solving 4.5 + c = -4.533210783 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 = -4.533210783 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + c = -4.533210783 + -4.5 c = -4.533210783 + -4.5 Combine like terms: -4.533210783 + -4.5 = -9.033210783 c = -9.033210783 Simplifying c = -9.033210783

Solution

The solution to the problem is based on the solutions from the subproblems. c = {0.033210783, -9.033210783}

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