x(x+6)=2(3+x)-x^2+2x+25

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Solution for x(x+6)=2(3+x)-x^2+2x+25 equation:


Simplifying
x(x + 6) = 2(3 + x) + -1x2 + 2x + 25

Reorder the terms:
x(6 + x) = 2(3 + x) + -1x2 + 2x + 25
(6 * x + x * x) = 2(3 + x) + -1x2 + 2x + 25
(6x + x2) = 2(3 + x) + -1x2 + 2x + 25
6x + x2 = (3 * 2 + x * 2) + -1x2 + 2x + 25
6x + x2 = (6 + 2x) + -1x2 + 2x + 25

Reorder the terms:
6x + x2 = 6 + 25 + 2x + 2x + -1x2

Combine like terms: 6 + 25 = 31
6x + x2 = 31 + 2x + 2x + -1x2

Combine like terms: 2x + 2x = 4x
6x + x2 = 31 + 4x + -1x2

Solving
6x + x2 = 31 + 4x + -1x2

Solving for variable 'x'.

Reorder the terms:
-31 + 6x + -4x + x2 + x2 = 31 + 4x + -1x2 + -31 + -4x + x2

Combine like terms: 6x + -4x = 2x
-31 + 2x + x2 + x2 = 31 + 4x + -1x2 + -31 + -4x + x2

Combine like terms: x2 + x2 = 2x2
-31 + 2x + 2x2 = 31 + 4x + -1x2 + -31 + -4x + x2

Reorder the terms:
-31 + 2x + 2x2 = 31 + -31 + 4x + -4x + -1x2 + x2

Combine like terms: 31 + -31 = 0
-31 + 2x + 2x2 = 0 + 4x + -4x + -1x2 + x2
-31 + 2x + 2x2 = 4x + -4x + -1x2 + x2

Combine like terms: 4x + -4x = 0
-31 + 2x + 2x2 = 0 + -1x2 + x2
-31 + 2x + 2x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-31 + 2x + 2x2 = 0

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

Divide each side by '2'.
-15.5 + x + x2 = 0

Move the constant term to the right:

Add '15.5' to each side of the equation.
-15.5 + x + 15.5 + x2 = 0 + 15.5

Reorder the terms:
-15.5 + 15.5 + x + x2 = 0 + 15.5

Combine like terms: -15.5 + 15.5 = 0.0
0.0 + x + x2 = 0 + 15.5
x + x2 = 0 + 15.5

Combine like terms: 0 + 15.5 = 15.5
x + x2 = 15.5

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 15.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 15.5 + 0.25

Combine like terms: 15.5 + 0.25 = 15.75
1.25 + x2 = 15.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 15.75

Calculate the square root of the right side: 3.968626967

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.968626967 and -3.968626967.

Subproblem 1

x + 0.5 = 3.968626967 Simplifying x + 0.5 = 3.968626967 Reorder the terms: 0.5 + x = 3.968626967 Solving 0.5 + x = 3.968626967 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 3.968626967 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.968626967 + -0.5 x = 3.968626967 + -0.5 Combine like terms: 3.968626967 + -0.5 = 3.468626967 x = 3.468626967 Simplifying x = 3.468626967

Subproblem 2

x + 0.5 = -3.968626967 Simplifying x + 0.5 = -3.968626967 Reorder the terms: 0.5 + x = -3.968626967 Solving 0.5 + x = -3.968626967 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -3.968626967 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.968626967 + -0.5 x = -3.968626967 + -0.5 Combine like terms: -3.968626967 + -0.5 = -4.468626967 x = -4.468626967 Simplifying x = -4.468626967

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.468626967, -4.468626967}

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