x(x+3)+2(x-6)=0

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Solution for x(x+3)+2(x-6)=0 equation:


Simplifying
x(x + 3) + 2(x + -6) = 0

Reorder the terms:
x(3 + x) + 2(x + -6) = 0
(3 * x + x * x) + 2(x + -6) = 0
(3x + x2) + 2(x + -6) = 0

Reorder the terms:
3x + x2 + 2(-6 + x) = 0
3x + x2 + (-6 * 2 + x * 2) = 0
3x + x2 + (-12 + 2x) = 0

Reorder the terms:
-12 + 3x + 2x + x2 = 0

Combine like terms: 3x + 2x = 5x
-12 + 5x + x2 = 0

Solving
-12 + 5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 5x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + 5x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 5x + x2 = 0 + 12
5x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
5x + x2 = 12

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 = 12 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 12 + 6.25

Combine like terms: 12 + 6.25 = 18.25
6.25 + 5x + x2 = 18.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 18.25

Calculate the square root of the right side: 4.272001873

Break this problem into two subproblems by setting 
(x + 2.5) equal to 4.272001873 and -4.272001873.

Subproblem 1

x + 2.5 = 4.272001873 Simplifying x + 2.5 = 4.272001873 Reorder the terms: 2.5 + x = 4.272001873 Solving 2.5 + x = 4.272001873 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 = 4.272001873 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 4.272001873 + -2.5 x = 4.272001873 + -2.5 Combine like terms: 4.272001873 + -2.5 = 1.772001873 x = 1.772001873 Simplifying x = 1.772001873

Subproblem 2

x + 2.5 = -4.272001873 Simplifying x + 2.5 = -4.272001873 Reorder the terms: 2.5 + x = -4.272001873 Solving 2.5 + x = -4.272001873 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 = -4.272001873 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -4.272001873 + -2.5 x = -4.272001873 + -2.5 Combine like terms: -4.272001873 + -2.5 = -6.772001873 x = -6.772001873 Simplifying x = -6.772001873

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.772001873, -6.772001873}

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