2c(5c-1)=8c+9

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Solution for 2c(5c-1)=8c+9 equation:


Simplifying
2c(5c + -1) = 8c + 9

Reorder the terms:
2c(-1 + 5c) = 8c + 9
(-1 * 2c + 5c * 2c) = 8c + 9
(-2c + 10c2) = 8c + 9

Reorder the terms:
-2c + 10c2 = 9 + 8c

Solving
-2c + 10c2 = 9 + 8c

Solving for variable 'c'.

Reorder the terms:
-9 + -2c + -8c + 10c2 = 9 + 8c + -9 + -8c

Combine like terms: -2c + -8c = -10c
-9 + -10c + 10c2 = 9 + 8c + -9 + -8c

Reorder the terms:
-9 + -10c + 10c2 = 9 + -9 + 8c + -8c

Combine like terms: 9 + -9 = 0
-9 + -10c + 10c2 = 0 + 8c + -8c
-9 + -10c + 10c2 = 8c + -8c

Combine like terms: 8c + -8c = 0
-9 + -10c + 10c2 = 0

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

Divide each side by '10'.
-0.9 + -1c + c2 = 0.0

Move the constant term to the right:

Add '0.9' to each side of the equation.
-0.9 + -1c + 0.9 + c2 = 0.0 + 0.9

Reorder the terms:
-0.9 + 0.9 + -1c + c2 = 0.0 + 0.9

Combine like terms: -0.9 + 0.9 = 0.0
0.0 + -1c + c2 = 0.0 + 0.9
-1c + c2 = 0.0 + 0.9

Combine like terms: 0.0 + 0.9 = 0.9
-1c + c2 = 0.9

The c term is -1c.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1c + 0.25 + c2 = 0.9 + 0.25

Reorder the terms:
0.25 + -1c + c2 = 0.9 + 0.25

Combine like terms: 0.9 + 0.25 = 1.15
0.25 + -1c + c2 = 1.15

Factor a perfect square on the left side:
(c + -0.5)(c + -0.5) = 1.15

Calculate the square root of the right side: 1.072380529

Break this problem into two subproblems by setting 
(c + -0.5) equal to 1.072380529 and -1.072380529.

Subproblem 1

c + -0.5 = 1.072380529 Simplifying c + -0.5 = 1.072380529 Reorder the terms: -0.5 + c = 1.072380529 Solving -0.5 + c = 1.072380529 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + c = 1.072380529 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + c = 1.072380529 + 0.5 c = 1.072380529 + 0.5 Combine like terms: 1.072380529 + 0.5 = 1.572380529 c = 1.572380529 Simplifying c = 1.572380529

Subproblem 2

c + -0.5 = -1.072380529 Simplifying c + -0.5 = -1.072380529 Reorder the terms: -0.5 + c = -1.072380529 Solving -0.5 + c = -1.072380529 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + c = -1.072380529 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + c = -1.072380529 + 0.5 c = -1.072380529 + 0.5 Combine like terms: -1.072380529 + 0.5 = -0.572380529 c = -0.572380529 Simplifying c = -0.572380529

Solution

The solution to the problem is based on the solutions from the subproblems. c = {1.572380529, -0.572380529}

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