3x^2=-9x-2

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Solution for 3x^2=-9x-2 equation:


Simplifying
3x2 = -9x + -2

Reorder the terms:
3x2 = -2 + -9x

Solving
3x2 = -2 + -9x

Solving for variable 'x'.

Reorder the terms:
2 + 9x + 3x2 = -2 + -9x + 2 + 9x

Reorder the terms:
2 + 9x + 3x2 = -2 + 2 + -9x + 9x

Combine like terms: -2 + 2 = 0
2 + 9x + 3x2 = 0 + -9x + 9x
2 + 9x + 3x2 = -9x + 9x

Combine like terms: -9x + 9x = 0
2 + 9x + 3x2 = 0

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

Divide each side by '3'.
0.6666666667 + 3x + x2 = 0

Move the constant term to the right:

Add '-0.6666666667' to each side of the equation.
0.6666666667 + 3x + -0.6666666667 + x2 = 0 + -0.6666666667

Reorder the terms:
0.6666666667 + -0.6666666667 + 3x + x2 = 0 + -0.6666666667

Combine like terms: 0.6666666667 + -0.6666666667 = 0.0000000000
0.0000000000 + 3x + x2 = 0 + -0.6666666667
3x + x2 = 0 + -0.6666666667

Combine like terms: 0 + -0.6666666667 = -0.6666666667
3x + x2 = -0.6666666667

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 = -0.6666666667 + 2.25

Reorder the terms:
2.25 + 3x + x2 = -0.6666666667 + 2.25

Combine like terms: -0.6666666667 + 2.25 = 1.5833333333
2.25 + 3x + x2 = 1.5833333333

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 1.5833333333

Calculate the square root of the right side: 1.258305739

Break this problem into two subproblems by setting 
(x + 1.5) equal to 1.258305739 and -1.258305739.

Subproblem 1

x + 1.5 = 1.258305739 Simplifying x + 1.5 = 1.258305739 Reorder the terms: 1.5 + x = 1.258305739 Solving 1.5 + x = 1.258305739 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 = 1.258305739 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 1.258305739 + -1.5 x = 1.258305739 + -1.5 Combine like terms: 1.258305739 + -1.5 = -0.241694261 x = -0.241694261 Simplifying x = -0.241694261

Subproblem 2

x + 1.5 = -1.258305739 Simplifying x + 1.5 = -1.258305739 Reorder the terms: 1.5 + x = -1.258305739 Solving 1.5 + x = -1.258305739 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 = -1.258305739 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -1.258305739 + -1.5 x = -1.258305739 + -1.5 Combine like terms: -1.258305739 + -1.5 = -2.758305739 x = -2.758305739 Simplifying x = -2.758305739

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.241694261, -2.758305739}

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