x(x-2)=3(x+6)

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Solution for x(x-2)=3(x+6) equation:


Simplifying
x(x + -2) = 3(x + 6)

Reorder the terms:
x(-2 + x) = 3(x + 6)
(-2 * x + x * x) = 3(x + 6)
(-2x + x2) = 3(x + 6)

Reorder the terms:
-2x + x2 = 3(6 + x)
-2x + x2 = (6 * 3 + x * 3)
-2x + x2 = (18 + 3x)

Solving
-2x + x2 = 18 + 3x

Solving for variable 'x'.

Reorder the terms:
-18 + -2x + -3x + x2 = 18 + 3x + -18 + -3x

Combine like terms: -2x + -3x = -5x
-18 + -5x + x2 = 18 + 3x + -18 + -3x

Reorder the terms:
-18 + -5x + x2 = 18 + -18 + 3x + -3x

Combine like terms: 18 + -18 = 0
-18 + -5x + x2 = 0 + 3x + -3x
-18 + -5x + x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-18 + -5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -5x + 18 + x2 = 0 + 18

Reorder the terms:
-18 + 18 + -5x + x2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -5x + x2 = 0 + 18
-5x + x2 = 0 + 18

Combine like terms: 0 + 18 = 18
-5x + x2 = 18

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 18 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 18 + 6.25

Combine like terms: 18 + 6.25 = 24.25
6.25 + -5x + x2 = 24.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 24.25

Calculate the square root of the right side: 4.924428901

Break this problem into two subproblems by setting 
(x + -2.5) equal to 4.924428901 and -4.924428901.

Subproblem 1

x + -2.5 = 4.924428901 Simplifying x + -2.5 = 4.924428901 Reorder the terms: -2.5 + x = 4.924428901 Solving -2.5 + x = 4.924428901 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 4.924428901 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 4.924428901 + 2.5 x = 4.924428901 + 2.5 Combine like terms: 4.924428901 + 2.5 = 7.424428901 x = 7.424428901 Simplifying x = 7.424428901

Subproblem 2

x + -2.5 = -4.924428901 Simplifying x + -2.5 = -4.924428901 Reorder the terms: -2.5 + x = -4.924428901 Solving -2.5 + x = -4.924428901 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -4.924428901 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -4.924428901 + 2.5 x = -4.924428901 + 2.5 Combine like terms: -4.924428901 + 2.5 = -2.424428901 x = -2.424428901 Simplifying x = -2.424428901

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.424428901, -2.424428901}

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