2x(3x-12)=(4x+9)

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Solution for 2x(3x-12)=(4x+9) equation:


Simplifying
2x(3x + -12) = (4x + 9)

Reorder the terms:
2x(-12 + 3x) = (4x + 9)
(-12 * 2x + 3x * 2x) = (4x + 9)
(-24x + 6x2) = (4x + 9)

Reorder the terms:
-24x + 6x2 = (9 + 4x)

Remove parenthesis around (9 + 4x)
-24x + 6x2 = 9 + 4x

Solving
-24x + 6x2 = 9 + 4x

Solving for variable 'x'.

Reorder the terms:
-9 + -24x + -4x + 6x2 = 9 + 4x + -9 + -4x

Combine like terms: -24x + -4x = -28x
-9 + -28x + 6x2 = 9 + 4x + -9 + -4x

Reorder the terms:
-9 + -28x + 6x2 = 9 + -9 + 4x + -4x

Combine like terms: 9 + -9 = 0
-9 + -28x + 6x2 = 0 + 4x + -4x
-9 + -28x + 6x2 = 4x + -4x

Combine like terms: 4x + -4x = 0
-9 + -28x + 6x2 = 0

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

Divide each side by '6'.
-1.5 + -4.666666667x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -4.666666667x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -4.666666667x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -4.666666667x + x2 = 0 + 1.5
-4.666666667x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-4.666666667x + x2 = 1.5

The x term is -4.666666667x.  Take half its coefficient (-2.333333334).
Square it (5.444444448) and add it to both sides.

Add '5.444444448' to each side of the equation.
-4.666666667x + 5.444444448 + x2 = 1.5 + 5.444444448

Reorder the terms:
5.444444448 + -4.666666667x + x2 = 1.5 + 5.444444448

Combine like terms: 1.5 + 5.444444448 = 6.944444448
5.444444448 + -4.666666667x + x2 = 6.944444448

Factor a perfect square on the left side:
(x + -2.333333334)(x + -2.333333334) = 6.944444448

Calculate the square root of the right side: 2.635231384

Break this problem into two subproblems by setting 
(x + -2.333333334) equal to 2.635231384 and -2.635231384.

Subproblem 1

x + -2.333333334 = 2.635231384 Simplifying x + -2.333333334 = 2.635231384 Reorder the terms: -2.333333334 + x = 2.635231384 Solving -2.333333334 + x = 2.635231384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.333333334' to each side of the equation. -2.333333334 + 2.333333334 + x = 2.635231384 + 2.333333334 Combine like terms: -2.333333334 + 2.333333334 = 0.000000000 0.000000000 + x = 2.635231384 + 2.333333334 x = 2.635231384 + 2.333333334 Combine like terms: 2.635231384 + 2.333333334 = 4.968564718 x = 4.968564718 Simplifying x = 4.968564718

Subproblem 2

x + -2.333333334 = -2.635231384 Simplifying x + -2.333333334 = -2.635231384 Reorder the terms: -2.333333334 + x = -2.635231384 Solving -2.333333334 + x = -2.635231384 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.333333334' to each side of the equation. -2.333333334 + 2.333333334 + x = -2.635231384 + 2.333333334 Combine like terms: -2.333333334 + 2.333333334 = 0.000000000 0.000000000 + x = -2.635231384 + 2.333333334 x = -2.635231384 + 2.333333334 Combine like terms: -2.635231384 + 2.333333334 = -0.30189805 x = -0.30189805 Simplifying x = -0.30189805

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.968564718, -0.30189805}

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