2x(x)=x+12(x+3)

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Solution for 2x(x)=x+12(x+3) equation:


Simplifying
2x(x) = x + 12(x + 3)

Multiply x * x
2x2 = x + 12(x + 3)

Reorder the terms:
2x2 = x + 12(3 + x)
2x2 = x + (3 * 12 + x * 12)
2x2 = x + (36 + 12x)

Reorder the terms:
2x2 = 36 + x + 12x

Combine like terms: x + 12x = 13x
2x2 = 36 + 13x

Solving
2x2 = 36 + 13x

Solving for variable 'x'.

Reorder the terms:
-36 + -13x + 2x2 = 36 + 13x + -36 + -13x

Reorder the terms:
-36 + -13x + 2x2 = 36 + -36 + 13x + -13x

Combine like terms: 36 + -36 = 0
-36 + -13x + 2x2 = 0 + 13x + -13x
-36 + -13x + 2x2 = 13x + -13x

Combine like terms: 13x + -13x = 0
-36 + -13x + 2x2 = 0

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

Divide each side by '2'.
-18 + -6.5x + x2 = 0

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -6.5x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + -6.5x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -6.5x + x2 = 0 + 18
-6.5x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
-6.5x + x2 = 18

The x term is -6.5x.  Take half its coefficient (-3.25).
Square it (10.5625) and add it to both sides.

Add '10.5625' to each side of the equation.
-6.5x + 10.5625 + x2 = 18 + 10.5625

Reorder the terms:
10.5625 + -6.5x + x2 = 18 + 10.5625

Combine like terms: 18 + 10.5625 = 28.5625
10.5625 + -6.5x + x2 = 28.5625

Factor a perfect square on the left side:
(x + -3.25)(x + -3.25) = 28.5625

Calculate the square root of the right side: 5.344389582

Break this problem into two subproblems by setting 
(x + -3.25) equal to 5.344389582 and -5.344389582.

Subproblem 1

x + -3.25 = 5.344389582 Simplifying x + -3.25 = 5.344389582 Reorder the terms: -3.25 + x = 5.344389582 Solving -3.25 + x = 5.344389582 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = 5.344389582 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = 5.344389582 + 3.25 x = 5.344389582 + 3.25 Combine like terms: 5.344389582 + 3.25 = 8.594389582 x = 8.594389582 Simplifying x = 8.594389582

Subproblem 2

x + -3.25 = -5.344389582 Simplifying x + -3.25 = -5.344389582 Reorder the terms: -3.25 + x = -5.344389582 Solving -3.25 + x = -5.344389582 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.25' to each side of the equation. -3.25 + 3.25 + x = -5.344389582 + 3.25 Combine like terms: -3.25 + 3.25 = 0.00 0.00 + x = -5.344389582 + 3.25 x = -5.344389582 + 3.25 Combine like terms: -5.344389582 + 3.25 = -2.094389582 x = -2.094389582 Simplifying x = -2.094389582

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.594389582, -2.094389582}

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