x(x-2)=2(x+18)

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Solution for x(x-2)=2(x+18) equation:


Simplifying
x(x + -2) = 2(x + 18)

Reorder the terms:
x(-2 + x) = 2(x + 18)
(-2 * x + x * x) = 2(x + 18)
(-2x + x2) = 2(x + 18)

Reorder the terms:
-2x + x2 = 2(18 + x)
-2x + x2 = (18 * 2 + x * 2)
-2x + x2 = (36 + 2x)

Solving
-2x + x2 = 36 + 2x

Solving for variable 'x'.

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

Combine like terms: -2x + -2x = -4x
-36 + -4x + x2 = 36 + 2x + -36 + -2x

Reorder the terms:
-36 + -4x + x2 = 36 + -36 + 2x + -2x

Combine like terms: 36 + -36 = 0
-36 + -4x + x2 = 0 + 2x + -2x
-36 + -4x + x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-36 + -4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -4x + 36 + x2 = 0 + 36

Reorder the terms:
-36 + 36 + -4x + x2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -4x + x2 = 0 + 36
-4x + x2 = 0 + 36

Combine like terms: 0 + 36 = 36
-4x + x2 = 36

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 36 + 4

Reorder the terms:
4 + -4x + x2 = 36 + 4

Combine like terms: 36 + 4 = 40
4 + -4x + x2 = 40

Factor a perfect square on the left side:
(x + -2)(x + -2) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(x + -2) equal to 6.32455532 and -6.32455532.

Subproblem 1

x + -2 = 6.32455532 Simplifying x + -2 = 6.32455532 Reorder the terms: -2 + x = 6.32455532 Solving -2 + x = 6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 6.32455532 + 2 Combine like terms: -2 + 2 = 0 0 + x = 6.32455532 + 2 x = 6.32455532 + 2 Combine like terms: 6.32455532 + 2 = 8.32455532 x = 8.32455532 Simplifying x = 8.32455532

Subproblem 2

x + -2 = -6.32455532 Simplifying x + -2 = -6.32455532 Reorder the terms: -2 + x = -6.32455532 Solving -2 + x = -6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -6.32455532 + 2 Combine like terms: -2 + 2 = 0 0 + x = -6.32455532 + 2 x = -6.32455532 + 2 Combine like terms: -6.32455532 + 2 = -4.32455532 x = -4.32455532 Simplifying x = -4.32455532

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.32455532, -4.32455532}

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