x(x+3)=3-5x-x^2

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Solution for x(x+3)=3-5x-x^2 equation:


Simplifying
x(x + 3) = 3 + -5x + -1x2

Reorder the terms:
x(3 + x) = 3 + -5x + -1x2
(3 * x + x * x) = 3 + -5x + -1x2
(3x + x2) = 3 + -5x + -1x2

Solving
3x + x2 = 3 + -5x + -1x2

Solving for variable 'x'.

Reorder the terms:
-3 + 3x + 5x + x2 + x2 = 3 + -5x + -1x2 + -3 + 5x + x2

Combine like terms: 3x + 5x = 8x
-3 + 8x + x2 + x2 = 3 + -5x + -1x2 + -3 + 5x + x2

Combine like terms: x2 + x2 = 2x2
-3 + 8x + 2x2 = 3 + -5x + -1x2 + -3 + 5x + x2

Reorder the terms:
-3 + 8x + 2x2 = 3 + -3 + -5x + 5x + -1x2 + x2

Combine like terms: 3 + -3 = 0
-3 + 8x + 2x2 = 0 + -5x + 5x + -1x2 + x2
-3 + 8x + 2x2 = -5x + 5x + -1x2 + x2

Combine like terms: -5x + 5x = 0
-3 + 8x + 2x2 = 0 + -1x2 + x2
-3 + 8x + 2x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
-3 + 8x + 2x2 = 0

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

Divide each side by '2'.
-1.5 + 4x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + 4x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + 4x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + 4x + x2 = 0 + 1.5
4x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
4x + x2 = 1.5

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 = 1.5 + 4

Reorder the terms:
4 + 4x + x2 = 1.5 + 4

Combine like terms: 1.5 + 4 = 5.5
4 + 4x + x2 = 5.5

Factor a perfect square on the left side:
(x + 2)(x + 2) = 5.5

Calculate the square root of the right side: 2.34520788

Break this problem into two subproblems by setting 
(x + 2) equal to 2.34520788 and -2.34520788.

Subproblem 1

x + 2 = 2.34520788 Simplifying x + 2 = 2.34520788 Reorder the terms: 2 + x = 2.34520788 Solving 2 + x = 2.34520788 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 = 2.34520788 + -2 Combine like terms: 2 + -2 = 0 0 + x = 2.34520788 + -2 x = 2.34520788 + -2 Combine like terms: 2.34520788 + -2 = 0.34520788 x = 0.34520788 Simplifying x = 0.34520788

Subproblem 2

x + 2 = -2.34520788 Simplifying x + 2 = -2.34520788 Reorder the terms: 2 + x = -2.34520788 Solving 2 + x = -2.34520788 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 = -2.34520788 + -2 Combine like terms: 2 + -2 = 0 0 + x = -2.34520788 + -2 x = -2.34520788 + -2 Combine like terms: -2.34520788 + -2 = -4.34520788 x = -4.34520788 Simplifying x = -4.34520788

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.34520788, -4.34520788}

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