(x-.3)(2x-4)=12

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


Simplifying
(x + -0.3)(2x + -4) = 12

Reorder the terms:
(-0.3 + x)(2x + -4) = 12

Reorder the terms:
(-0.3 + x)(-4 + 2x) = 12

Multiply (-0.3 + x) * (-4 + 2x)
(-0.3(-4 + 2x) + x(-4 + 2x)) = 12
((-4 * -0.3 + 2x * -0.3) + x(-4 + 2x)) = 12
((1.2 + -0.6x) + x(-4 + 2x)) = 12
(1.2 + -0.6x + (-4 * x + 2x * x)) = 12
(1.2 + -0.6x + (-4x + 2x2)) = 12

Combine like terms: -0.6x + -4x = -4.6x
(1.2 + -4.6x + 2x2) = 12

Solving
1.2 + -4.6x + 2x2 = 12

Solving for variable 'x'.

Reorder the terms:
1.2 + -12 + -4.6x + 2x2 = 12 + -12

Combine like terms: 1.2 + -12 = -10.8
-10.8 + -4.6x + 2x2 = 12 + -12

Combine like terms: 12 + -12 = 0
-10.8 + -4.6x + 2x2 = 0

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

Divide each side by '2'.
-5.4 + -2.3x + x2 = 0

Move the constant term to the right:

Add '5.4' to each side of the equation.
-5.4 + -2.3x + 5.4 + x2 = 0 + 5.4

Reorder the terms:
-5.4 + 5.4 + -2.3x + x2 = 0 + 5.4

Combine like terms: -5.4 + 5.4 = 0.0
0.0 + -2.3x + x2 = 0 + 5.4
-2.3x + x2 = 0 + 5.4

Combine like terms: 0 + 5.4 = 5.4
-2.3x + x2 = 5.4

The x term is -2.3x.  Take half its coefficient (-1.15).
Square it (1.3225) and add it to both sides.

Add '1.3225' to each side of the equation.
-2.3x + 1.3225 + x2 = 5.4 + 1.3225

Reorder the terms:
1.3225 + -2.3x + x2 = 5.4 + 1.3225

Combine like terms: 5.4 + 1.3225 = 6.7225
1.3225 + -2.3x + x2 = 6.7225

Factor a perfect square on the left side:
(x + -1.15)(x + -1.15) = 6.7225

Calculate the square root of the right side: 2.592778432

Break this problem into two subproblems by setting 
(x + -1.15) equal to 2.592778432 and -2.592778432.

Subproblem 1

x + -1.15 = 2.592778432 Simplifying x + -1.15 = 2.592778432 Reorder the terms: -1.15 + x = 2.592778432 Solving -1.15 + x = 2.592778432 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.15' to each side of the equation. -1.15 + 1.15 + x = 2.592778432 + 1.15 Combine like terms: -1.15 + 1.15 = 0.00 0.00 + x = 2.592778432 + 1.15 x = 2.592778432 + 1.15 Combine like terms: 2.592778432 + 1.15 = 3.742778432 x = 3.742778432 Simplifying x = 3.742778432

Subproblem 2

x + -1.15 = -2.592778432 Simplifying x + -1.15 = -2.592778432 Reorder the terms: -1.15 + x = -2.592778432 Solving -1.15 + x = -2.592778432 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.15' to each side of the equation. -1.15 + 1.15 + x = -2.592778432 + 1.15 Combine like terms: -1.15 + 1.15 = 0.00 0.00 + x = -2.592778432 + 1.15 x = -2.592778432 + 1.15 Combine like terms: -2.592778432 + 1.15 = -1.442778432 x = -1.442778432 Simplifying x = -1.442778432

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.742778432, -1.442778432}

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