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

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


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

Reorder the terms:
3x(2 + x) = -5x + -3
(2 * 3x + x * 3x) = -5x + -3
(6x + 3x2) = -5x + -3

Reorder the terms:
6x + 3x2 = -3 + -5x

Solving
6x + 3x2 = -3 + -5x

Solving for variable 'x'.

Reorder the terms:
3 + 6x + 5x + 3x2 = -3 + -5x + 3 + 5x

Combine like terms: 6x + 5x = 11x
3 + 11x + 3x2 = -3 + -5x + 3 + 5x

Reorder the terms:
3 + 11x + 3x2 = -3 + 3 + -5x + 5x

Combine like terms: -3 + 3 = 0
3 + 11x + 3x2 = 0 + -5x + 5x
3 + 11x + 3x2 = -5x + 5x

Combine like terms: -5x + 5x = 0
3 + 11x + 3x2 = 0

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

Divide each side by '3'.
1 + 3.666666667x + x2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 3.666666667x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + 3.666666667x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 3.666666667x + x2 = 0 + -1
3.666666667x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
3.666666667x + x2 = -1

The x term is 3.666666667x.  Take half its coefficient (1.833333334).
Square it (3.361111114) and add it to both sides.

Add '3.361111114' to each side of the equation.
3.666666667x + 3.361111114 + x2 = -1 + 3.361111114

Reorder the terms:
3.361111114 + 3.666666667x + x2 = -1 + 3.361111114

Combine like terms: -1 + 3.361111114 = 2.361111114
3.361111114 + 3.666666667x + x2 = 2.361111114

Factor a perfect square on the left side:
(x + 1.833333334)(x + 1.833333334) = 2.361111114

Calculate the square root of the right side: 1.536590744

Break this problem into two subproblems by setting 
(x + 1.833333334) equal to 1.536590744 and -1.536590744.

Subproblem 1

x + 1.833333334 = 1.536590744 Simplifying x + 1.833333334 = 1.536590744 Reorder the terms: 1.833333334 + x = 1.536590744 Solving 1.833333334 + x = 1.536590744 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.833333334' to each side of the equation. 1.833333334 + -1.833333334 + x = 1.536590744 + -1.833333334 Combine like terms: 1.833333334 + -1.833333334 = 0.000000000 0.000000000 + x = 1.536590744 + -1.833333334 x = 1.536590744 + -1.833333334 Combine like terms: 1.536590744 + -1.833333334 = -0.29674259 x = -0.29674259 Simplifying x = -0.29674259

Subproblem 2

x + 1.833333334 = -1.536590744 Simplifying x + 1.833333334 = -1.536590744 Reorder the terms: 1.833333334 + x = -1.536590744 Solving 1.833333334 + x = -1.536590744 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.833333334' to each side of the equation. 1.833333334 + -1.833333334 + x = -1.536590744 + -1.833333334 Combine like terms: 1.833333334 + -1.833333334 = 0.000000000 0.000000000 + x = -1.536590744 + -1.833333334 x = -1.536590744 + -1.833333334 Combine like terms: -1.536590744 + -1.833333334 = -3.369924078 x = -3.369924078 Simplifying x = -3.369924078

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.29674259, -3.369924078}

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