9(x^2+3x)-2=0

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Solution for 9(x^2+3x)-2=0 equation:


Simplifying
9(x2 + 3x) + -2 = 0

Reorder the terms:
9(3x + x2) + -2 = 0
(3x * 9 + x2 * 9) + -2 = 0
(27x + 9x2) + -2 = 0

Reorder the terms:
-2 + 27x + 9x2 = 0

Solving
-2 + 27x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-0.2222222222 + 3x + x2 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + 3x + 0.2222222222 + x2 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + 3x + x2 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + 3x + x2 = 0 + 0.2222222222
3x + x2 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
3x + x2 = 0.2222222222

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 0.2222222222 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 0.2222222222 + 2.25

Combine like terms: 0.2222222222 + 2.25 = 2.4722222222
2.25 + 3x + x2 = 2.4722222222

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 2.4722222222

Calculate the square root of the right side: 1.572330189

Break this problem into two subproblems by setting 
(x + 1.5) equal to 1.572330189 and -1.572330189.

Subproblem 1

x + 1.5 = 1.572330189 Simplifying x + 1.5 = 1.572330189 Reorder the terms: 1.5 + x = 1.572330189 Solving 1.5 + x = 1.572330189 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 1.572330189 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 1.572330189 + -1.5 x = 1.572330189 + -1.5 Combine like terms: 1.572330189 + -1.5 = 0.072330189 x = 0.072330189 Simplifying x = 0.072330189

Subproblem 2

x + 1.5 = -1.572330189 Simplifying x + 1.5 = -1.572330189 Reorder the terms: 1.5 + x = -1.572330189 Solving 1.5 + x = -1.572330189 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -1.572330189 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -1.572330189 + -1.5 x = -1.572330189 + -1.5 Combine like terms: -1.572330189 + -1.5 = -3.072330189 x = -3.072330189 Simplifying x = -3.072330189

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.072330189, -3.072330189}

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