9x(3x+8)=22

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Solution for 9x(3x+8)=22 equation:


Simplifying
9x(3x + 8) = 22

Reorder the terms:
9x(8 + 3x) = 22
(8 * 9x + 3x * 9x) = 22
(72x + 27x2) = 22

Solving
72x + 27x2 = 22

Solving for variable 'x'.

Reorder the terms:
-22 + 72x + 27x2 = 22 + -22

Combine like terms: 22 + -22 = 0
-22 + 72x + 27x2 = 0

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

Divide each side by '27'.
-0.8148148148 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '0.8148148148' to each side of the equation.
-0.8148148148 + 2.666666667x + 0.8148148148 + x2 = 0 + 0.8148148148

Reorder the terms:
-0.8148148148 + 0.8148148148 + 2.666666667x + x2 = 0 + 0.8148148148

Combine like terms: -0.8148148148 + 0.8148148148 = 0.0000000000
0.0000000000 + 2.666666667x + x2 = 0 + 0.8148148148
2.666666667x + x2 = 0 + 0.8148148148

Combine like terms: 0 + 0.8148148148 = 0.8148148148
2.666666667x + x2 = 0.8148148148

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 = 0.8148148148 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 0.8148148148 + 1.777777780

Combine like terms: 0.8148148148 + 1.777777780 = 2.5925925948
1.777777780 + 2.666666667x + x2 = 2.5925925948

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 2.5925925948

Calculate the square root of the right side: 1.610152972

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 1.610152972 and -1.610152972.

Subproblem 1

x + 1.333333334 = 1.610152972 Simplifying x + 1.333333334 = 1.610152972 Reorder the terms: 1.333333334 + x = 1.610152972 Solving 1.333333334 + x = 1.610152972 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 = 1.610152972 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 1.610152972 + -1.333333334 x = 1.610152972 + -1.333333334 Combine like terms: 1.610152972 + -1.333333334 = 0.276819638 x = 0.276819638 Simplifying x = 0.276819638

Subproblem 2

x + 1.333333334 = -1.610152972 Simplifying x + 1.333333334 = -1.610152972 Reorder the terms: 1.333333334 + x = -1.610152972 Solving 1.333333334 + x = -1.610152972 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 = -1.610152972 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -1.610152972 + -1.333333334 x = -1.610152972 + -1.333333334 Combine like terms: -1.610152972 + -1.333333334 = -2.943486306 x = -2.943486306 Simplifying x = -2.943486306

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.276819638, -2.943486306}

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