2x(x-2)=3(x+8)

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Solution for 2x(x-2)=3(x+8) equation:


Simplifying
2x(x + -2) = 3(x + 8)

Reorder the terms:
2x(-2 + x) = 3(x + 8)
(-2 * 2x + x * 2x) = 3(x + 8)
(-4x + 2x2) = 3(x + 8)

Reorder the terms:
-4x + 2x2 = 3(8 + x)
-4x + 2x2 = (8 * 3 + x * 3)
-4x + 2x2 = (24 + 3x)

Solving
-4x + 2x2 = 24 + 3x

Solving for variable 'x'.

Reorder the terms:
-24 + -4x + -3x + 2x2 = 24 + 3x + -24 + -3x

Combine like terms: -4x + -3x = -7x
-24 + -7x + 2x2 = 24 + 3x + -24 + -3x

Reorder the terms:
-24 + -7x + 2x2 = 24 + -24 + 3x + -3x

Combine like terms: 24 + -24 = 0
-24 + -7x + 2x2 = 0 + 3x + -3x
-24 + -7x + 2x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-24 + -7x + 2x2 = 0

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

Divide each side by '2'.
-12 + -3.5x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -3.5x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -3.5x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -3.5x + x2 = 0 + 12
-3.5x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-3.5x + x2 = 12

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 12 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 12 + 3.0625

Combine like terms: 12 + 3.0625 = 15.0625
3.0625 + -3.5x + x2 = 15.0625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 15.0625

Calculate the square root of the right side: 3.881043674

Break this problem into two subproblems by setting 
(x + -1.75) equal to 3.881043674 and -3.881043674.

Subproblem 1

x + -1.75 = 3.881043674 Simplifying x + -1.75 = 3.881043674 Reorder the terms: -1.75 + x = 3.881043674 Solving -1.75 + x = 3.881043674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 3.881043674 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 3.881043674 + 1.75 x = 3.881043674 + 1.75 Combine like terms: 3.881043674 + 1.75 = 5.631043674 x = 5.631043674 Simplifying x = 5.631043674

Subproblem 2

x + -1.75 = -3.881043674 Simplifying x + -1.75 = -3.881043674 Reorder the terms: -1.75 + x = -3.881043674 Solving -1.75 + x = -3.881043674 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -3.881043674 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -3.881043674 + 1.75 x = -3.881043674 + 1.75 Combine like terms: -3.881043674 + 1.75 = -2.131043674 x = -2.131043674 Simplifying x = -2.131043674

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.631043674, -2.131043674}

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