3x^2+9x-290=0

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Solution for 3x^2+9x-290=0 equation: 


Simplifying
3x2 + 9x + -290 = 0

Reorder the terms:
-290 + 9x + 3x2 = 0

Solving
-290 + 9x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-96.66666667 + 3x + x2 = 0

Move the constant term to the right:

Add '96.66666667' to each side of the equation.
-96.66666667 + 3x + 96.66666667 + x2 = 0 + 96.66666667

Reorder the terms:
-96.66666667 + 96.66666667 + 3x + x2 = 0 + 96.66666667

Combine like terms: -96.66666667 + 96.66666667 = 0.00000000
0.00000000 + 3x + x2 = 0 + 96.66666667
3x + x2 = 0 + 96.66666667

Combine like terms: 0 + 96.66666667 = 96.66666667
3x + x2 = 96.66666667

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 = 96.66666667 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 96.66666667 + 2.25

Combine like terms: 96.66666667 + 2.25 = 98.91666667
2.25 + 3x + x2 = 98.91666667

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 98.91666667

Calculate the square root of the right side: 9.945685832

Break this problem into two subproblems by setting 
(x + 1.5) equal to 9.945685832 and -9.945685832.


Subproblem 1
x + 1.5 = 9.945685832

Simplifying
x + 1.5 = 9.945685832

Reorder the terms:
1.5 + x = 9.945685832

Solving
1.5 + x = 9.945685832

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 = 9.945685832 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = 9.945685832 + -1.5
x = 9.945685832 + -1.5

Combine like terms: 9.945685832 + -1.5 = 8.445685832
x = 8.445685832

Simplifying
x = 8.445685832


Subproblem 2
x + 1.5 = -9.945685832

Simplifying
x + 1.5 = -9.945685832

Reorder the terms:
1.5 + x = -9.945685832

Solving
1.5 + x = -9.945685832

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 = -9.945685832 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = -9.945685832 + -1.5
x = -9.945685832 + -1.5

Combine like terms: -9.945685832 + -1.5 = -11.445685832
x = -11.445685832

Simplifying
x = -11.445685832


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {8.445685832, -11.445685832}

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