-2x(5-3x)=12-3(5-x)

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Solution for -2x(5-3x)=12-3(5-x) equation:


Simplifying
-2x(5 + -3x) = 12 + -3(5 + -1x)
(5 * -2x + -3x * -2x) = 12 + -3(5 + -1x)
(-10x + 6x2) = 12 + -3(5 + -1x)
-10x + 6x2 = 12 + (5 * -3 + -1x * -3)
-10x + 6x2 = 12 + (-15 + 3x)

Combine like terms: 12 + -15 = -3
-10x + 6x2 = -3 + 3x

Solving
-10x + 6x2 = -3 + 3x

Solving for variable 'x'.

Reorder the terms:
3 + -10x + -3x + 6x2 = -3 + 3x + 3 + -3x

Combine like terms: -10x + -3x = -13x
3 + -13x + 6x2 = -3 + 3x + 3 + -3x

Reorder the terms:
3 + -13x + 6x2 = -3 + 3 + 3x + -3x

Combine like terms: -3 + 3 = 0
3 + -13x + 6x2 = 0 + 3x + -3x
3 + -13x + 6x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
3 + -13x + 6x2 = 0

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

Divide each side by '6'.
0.5 + -2.166666667x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -2.166666667x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + -2.166666667x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -2.166666667x + x2 = 0 + -0.5
-2.166666667x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
-2.166666667x + x2 = -0.5

The x term is -2.166666667x.  Take half its coefficient (-1.083333334).
Square it (1.173611113) and add it to both sides.

Add '1.173611113' to each side of the equation.
-2.166666667x + 1.173611113 + x2 = -0.5 + 1.173611113

Reorder the terms:
1.173611113 + -2.166666667x + x2 = -0.5 + 1.173611113

Combine like terms: -0.5 + 1.173611113 = 0.673611113
1.173611113 + -2.166666667x + x2 = 0.673611113

Factor a perfect square on the left side:
(x + -1.083333334)(x + -1.083333334) = 0.673611113

Calculate the square root of the right side: 0.820738151

Break this problem into two subproblems by setting 
(x + -1.083333334) equal to 0.820738151 and -0.820738151.

Subproblem 1

x + -1.083333334 = 0.820738151 Simplifying x + -1.083333334 = 0.820738151 Reorder the terms: -1.083333334 + x = 0.820738151 Solving -1.083333334 + x = 0.820738151 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.083333334' to each side of the equation. -1.083333334 + 1.083333334 + x = 0.820738151 + 1.083333334 Combine like terms: -1.083333334 + 1.083333334 = 0.000000000 0.000000000 + x = 0.820738151 + 1.083333334 x = 0.820738151 + 1.083333334 Combine like terms: 0.820738151 + 1.083333334 = 1.904071485 x = 1.904071485 Simplifying x = 1.904071485

Subproblem 2

x + -1.083333334 = -0.820738151 Simplifying x + -1.083333334 = -0.820738151 Reorder the terms: -1.083333334 + x = -0.820738151 Solving -1.083333334 + x = -0.820738151 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.083333334' to each side of the equation. -1.083333334 + 1.083333334 + x = -0.820738151 + 1.083333334 Combine like terms: -1.083333334 + 1.083333334 = 0.000000000 0.000000000 + x = -0.820738151 + 1.083333334 x = -0.820738151 + 1.083333334 Combine like terms: -0.820738151 + 1.083333334 = 0.262595183 x = 0.262595183 Simplifying x = 0.262595183

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.904071485, 0.262595183}

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