5x(3x+2)=9

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Solution for 5x(3x+2)=9 equation:


Simplifying
5x(3x + 2) = 9

Reorder the terms:
5x(2 + 3x) = 9
(2 * 5x + 3x * 5x) = 9
(10x + 15x2) = 9

Solving
10x + 15x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + 10x + 15x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + 10x + 15x2 = 0

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

Divide each side by '15'.
-0.6 + 0.6666666667x + x2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + 0.6666666667x + 0.6 + x2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + 0.6666666667x + x2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + 0.6666666667x + x2 = 0 + 0.6
0.6666666667x + x2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
0.6666666667x + x2 = 0.6

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 = 0.6 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667x + x2 = 0.6 + 0.1111111112

Combine like terms: 0.6 + 0.1111111112 = 0.7111111112
0.1111111112 + 0.6666666667x + x2 = 0.7111111112

Factor a perfect square on the left side:
(x + 0.3333333334)(x + 0.3333333334) = 0.7111111112

Calculate the square root of the right side: 0.843274043

Break this problem into two subproblems by setting 
(x + 0.3333333334) equal to 0.843274043 and -0.843274043.

Subproblem 1

x + 0.3333333334 = 0.843274043 Simplifying x + 0.3333333334 = 0.843274043 Reorder the terms: 0.3333333334 + x = 0.843274043 Solving 0.3333333334 + x = 0.843274043 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 = 0.843274043 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = 0.843274043 + -0.3333333334 x = 0.843274043 + -0.3333333334 Combine like terms: 0.843274043 + -0.3333333334 = 0.5099407096 x = 0.5099407096 Simplifying x = 0.5099407096

Subproblem 2

x + 0.3333333334 = -0.843274043 Simplifying x + 0.3333333334 = -0.843274043 Reorder the terms: 0.3333333334 + x = -0.843274043 Solving 0.3333333334 + x = -0.843274043 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 = -0.843274043 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = -0.843274043 + -0.3333333334 x = -0.843274043 + -0.3333333334 Combine like terms: -0.843274043 + -0.3333333334 = -1.1766073764 x = -1.1766073764 Simplifying x = -1.1766073764

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5099407096, -1.1766073764}

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