3x(3x+2)=26

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Solution for 3x(3x+2)=26 equation:


Simplifying
3x(3x + 2) = 26

Reorder the terms:
3x(2 + 3x) = 26
(2 * 3x + 3x * 3x) = 26
(6x + 9x2) = 26

Solving
6x + 9x2 = 26

Solving for variable 'x'.

Reorder the terms:
-26 + 6x + 9x2 = 26 + -26

Combine like terms: 26 + -26 = 0
-26 + 6x + 9x2 = 0

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

Divide each side by '9'.
-2.888888889 + 0.6666666667x + x2 = 0

Move the constant term to the right:

Add '2.888888889' to each side of the equation.
-2.888888889 + 0.6666666667x + 2.888888889 + x2 = 0 + 2.888888889

Reorder the terms:
-2.888888889 + 2.888888889 + 0.6666666667x + x2 = 0 + 2.888888889

Combine like terms: -2.888888889 + 2.888888889 = 0.000000000
0.000000000 + 0.6666666667x + x2 = 0 + 2.888888889
0.6666666667x + x2 = 0 + 2.888888889

Combine like terms: 0 + 2.888888889 = 2.888888889
0.6666666667x + x2 = 2.888888889

The x term is 0.6666666667x.  Take half its coefficient (0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
0.6666666667x + 0.1111111112 + x2 = 2.888888889 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667x + x2 = 2.888888889 + 0.1111111112

Combine like terms: 2.888888889 + 0.1111111112 = 3.0000000002
0.1111111112 + 0.6666666667x + x2 = 3.0000000002

Factor a perfect square on the left side:
(x + 0.3333333334)(x + 0.3333333334) = 3.0000000002

Calculate the square root of the right side: 1.732050808

Break this problem into two subproblems by setting 
(x + 0.3333333334) equal to 1.732050808 and -1.732050808.

Subproblem 1

x + 0.3333333334 = 1.732050808 Simplifying x + 0.3333333334 = 1.732050808 Reorder the terms: 0.3333333334 + x = 1.732050808 Solving 0.3333333334 + x = 1.732050808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = 1.732050808 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = 1.732050808 + -0.3333333334 x = 1.732050808 + -0.3333333334 Combine like terms: 1.732050808 + -0.3333333334 = 1.3987174746 x = 1.3987174746 Simplifying x = 1.3987174746

Subproblem 2

x + 0.3333333334 = -1.732050808 Simplifying x + 0.3333333334 = -1.732050808 Reorder the terms: 0.3333333334 + x = -1.732050808 Solving 0.3333333334 + x = -1.732050808 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = -1.732050808 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = -1.732050808 + -0.3333333334 x = -1.732050808 + -0.3333333334 Combine like terms: -1.732050808 + -0.3333333334 = -2.0653841414 x = -2.0653841414 Simplifying x = -2.0653841414

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.3987174746, -2.0653841414}

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