3x(3x+8)=164

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Solution for 3x(3x+8)=164 equation:


Simplifying
3x(3x + 8) = 164

Reorder the terms:
3x(8 + 3x) = 164
(8 * 3x + 3x * 3x) = 164
(24x + 9x2) = 164

Solving
24x + 9x2 = 164

Solving for variable 'x'.

Reorder the terms:
-164 + 24x + 9x2 = 164 + -164

Combine like terms: 164 + -164 = 0
-164 + 24x + 9x2 = 0

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

Divide each side by '9'.
-18.22222222 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '18.22222222' to each side of the equation.
-18.22222222 + 2.666666667x + 18.22222222 + x2 = 0 + 18.22222222

Reorder the terms:
-18.22222222 + 18.22222222 + 2.666666667x + x2 = 0 + 18.22222222

Combine like terms: -18.22222222 + 18.22222222 = 0.00000000
0.00000000 + 2.666666667x + x2 = 0 + 18.22222222
2.666666667x + x2 = 0 + 18.22222222

Combine like terms: 0 + 18.22222222 = 18.22222222
2.666666667x + x2 = 18.22222222

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = 18.22222222 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 18.22222222 + 1.777777780

Combine like terms: 18.22222222 + 1.777777780 = 20
1.777777780 + 2.666666667x + x2 = 20

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 4.472135955 and -4.472135955.

Subproblem 1

x + 1.333333334 = 4.472135955 Simplifying x + 1.333333334 = 4.472135955 Reorder the terms: 1.333333334 + x = 4.472135955 Solving 1.333333334 + x = 4.472135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 4.472135955 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 4.472135955 + -1.333333334 x = 4.472135955 + -1.333333334 Combine like terms: 4.472135955 + -1.333333334 = 3.138802621 x = 3.138802621 Simplifying x = 3.138802621

Subproblem 2

x + 1.333333334 = -4.472135955 Simplifying x + 1.333333334 = -4.472135955 Reorder the terms: 1.333333334 + x = -4.472135955 Solving 1.333333334 + x = -4.472135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -4.472135955 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -4.472135955 + -1.333333334 x = -4.472135955 + -1.333333334 Combine like terms: -4.472135955 + -1.333333334 = -5.805469289 x = -5.805469289 Simplifying x = -5.805469289

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.138802621, -5.805469289}

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