12x+9=2x(5x+1)

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Solution for 12x+9=2x(5x+1) equation:


Simplifying
12x + 9 = 2x(5x + 1)

Reorder the terms:
9 + 12x = 2x(5x + 1)

Reorder the terms:
9 + 12x = 2x(1 + 5x)
9 + 12x = (1 * 2x + 5x * 2x)
9 + 12x = (2x + 10x2)

Solving
9 + 12x = 2x + 10x2

Solving for variable 'x'.

Combine like terms: 12x + -2x = 10x
9 + 10x + -10x2 = 2x + 10x2 + -2x + -10x2

Reorder the terms:
9 + 10x + -10x2 = 2x + -2x + 10x2 + -10x2

Combine like terms: 2x + -2x = 0
9 + 10x + -10x2 = 0 + 10x2 + -10x2
9 + 10x + -10x2 = 10x2 + -10x2

Combine like terms: 10x2 + -10x2 = 0
9 + 10x + -10x2 = 0

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

Divide each side by '-10'.
-0.9 + -1x + x2 = 0

Move the constant term to the right:

Add '0.9' to each side of the equation.
-0.9 + -1x + 0.9 + x2 = 0 + 0.9

Reorder the terms:
-0.9 + 0.9 + -1x + x2 = 0 + 0.9

Combine like terms: -0.9 + 0.9 = 0.0
0.0 + -1x + x2 = 0 + 0.9
-1x + x2 = 0 + 0.9

Combine like terms: 0 + 0.9 = 0.9
-1x + x2 = 0.9

The x term is -1x.  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.
-1x + 0.25 + x2 = 0.9 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 0.9 + 0.25

Combine like terms: 0.9 + 0.25 = 1.15
0.25 + -1x + x2 = 1.15

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

Calculate the square root of the right side: 1.072380529

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

Subproblem 1

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

Subproblem 2

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

Solution

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

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