9x^2+12x-(-3.35)=0

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Solution for 9x^2+12x-(-3.35)=0 equation:


Simplifying
9x2 + 12x + -1(-3.35) = 0

Multiply -1 * -3.35
9x2 + 12x + 3.35 = 0

Reorder the terms:
3.35 + 12x + 9x2 = 0

Solving
3.35 + 12x + 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'.
0.3722222222 + 1.333333333x + x2 = 0

Move the constant term to the right:

Add '-0.3722222222' to each side of the equation.
0.3722222222 + 1.333333333x + -0.3722222222 + x2 = 0 + -0.3722222222

Reorder the terms:
0.3722222222 + -0.3722222222 + 1.333333333x + x2 = 0 + -0.3722222222

Combine like terms: 0.3722222222 + -0.3722222222 = 0.0000000000
0.0000000000 + 1.333333333x + x2 = 0 + -0.3722222222
1.333333333x + x2 = 0 + -0.3722222222

Combine like terms: 0 + -0.3722222222 = -0.3722222222
1.333333333x + x2 = -0.3722222222

The x term is 1.333333333x.  Take half its coefficient (0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
1.333333333x + 0.4444444442 + x2 = -0.3722222222 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333x + x2 = -0.3722222222 + 0.4444444442

Combine like terms: -0.3722222222 + 0.4444444442 = 0.072222222
0.4444444442 + 1.333333333x + x2 = 0.072222222

Factor a perfect square on the left side:
(x + 0.6666666665)(x + 0.6666666665) = 0.072222222

Calculate the square root of the right side: 0.268741925

Break this problem into two subproblems by setting 
(x + 0.6666666665) equal to 0.268741925 and -0.268741925.

Subproblem 1

x + 0.6666666665 = 0.268741925 Simplifying x + 0.6666666665 = 0.268741925 Reorder the terms: 0.6666666665 + x = 0.268741925 Solving 0.6666666665 + x = 0.268741925 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = 0.268741925 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = 0.268741925 + -0.6666666665 x = 0.268741925 + -0.6666666665 Combine like terms: 0.268741925 + -0.6666666665 = -0.3979247415 x = -0.3979247415 Simplifying x = -0.3979247415

Subproblem 2

x + 0.6666666665 = -0.268741925 Simplifying x + 0.6666666665 = -0.268741925 Reorder the terms: 0.6666666665 + x = -0.268741925 Solving 0.6666666665 + x = -0.268741925 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = -0.268741925 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = -0.268741925 + -0.6666666665 x = -0.268741925 + -0.6666666665 Combine like terms: -0.268741925 + -0.6666666665 = -0.9354085915 x = -0.9354085915 Simplifying x = -0.9354085915

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.3979247415, -0.9354085915}

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