x(2x+3)=13-3x

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Solution for x(2x+3)=13-3x equation:


Simplifying
x(2x + 3) = 13 + -3x

Reorder the terms:
x(3 + 2x) = 13 + -3x
(3 * x + 2x * x) = 13 + -3x
(3x + 2x2) = 13 + -3x

Solving
3x + 2x2 = 13 + -3x

Solving for variable 'x'.

Reorder the terms:
-13 + 3x + 3x + 2x2 = 13 + -3x + -13 + 3x

Combine like terms: 3x + 3x = 6x
-13 + 6x + 2x2 = 13 + -3x + -13 + 3x

Reorder the terms:
-13 + 6x + 2x2 = 13 + -13 + -3x + 3x

Combine like terms: 13 + -13 = 0
-13 + 6x + 2x2 = 0 + -3x + 3x
-13 + 6x + 2x2 = -3x + 3x

Combine like terms: -3x + 3x = 0
-13 + 6x + 2x2 = 0

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

Divide each side by '2'.
-6.5 + 3x + x2 = 0

Move the constant term to the right:

Add '6.5' to each side of the equation.
-6.5 + 3x + 6.5 + x2 = 0 + 6.5

Reorder the terms:
-6.5 + 6.5 + 3x + x2 = 0 + 6.5

Combine like terms: -6.5 + 6.5 = 0.0
0.0 + 3x + x2 = 0 + 6.5
3x + x2 = 0 + 6.5

Combine like terms: 0 + 6.5 = 6.5
3x + x2 = 6.5

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 6.5 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 6.5 + 2.25

Combine like terms: 6.5 + 2.25 = 8.75
2.25 + 3x + x2 = 8.75

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 8.75

Calculate the square root of the right side: 2.958039892

Break this problem into two subproblems by setting 
(x + 1.5) equal to 2.958039892 and -2.958039892.

Subproblem 1

x + 1.5 = 2.958039892 Simplifying x + 1.5 = 2.958039892 Reorder the terms: 1.5 + x = 2.958039892 Solving 1.5 + x = 2.958039892 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 2.958039892 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 2.958039892 + -1.5 x = 2.958039892 + -1.5 Combine like terms: 2.958039892 + -1.5 = 1.458039892 x = 1.458039892 Simplifying x = 1.458039892

Subproblem 2

x + 1.5 = -2.958039892 Simplifying x + 1.5 = -2.958039892 Reorder the terms: 1.5 + x = -2.958039892 Solving 1.5 + x = -2.958039892 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -2.958039892 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -2.958039892 + -1.5 x = -2.958039892 + -1.5 Combine like terms: -2.958039892 + -1.5 = -4.458039892 x = -4.458039892 Simplifying x = -4.458039892

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.458039892, -4.458039892}

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