-9x^2+3x+7=0

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Solution for -9x^2+3x+7=0 equation: 


Simplifying
-9x2 + 3x + 7 = 0

Reorder the terms:
7 + 3x + -9x2 = 0

Solving
7 + 3x + -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'.
-0.7777777778 + -0.3333333333x + x2 = 0

Move the constant term to the right:

Add '0.7777777778' to each side of the equation.
-0.7777777778 + -0.3333333333x + 0.7777777778 + x2 = 0 + 0.7777777778

Reorder the terms:
-0.7777777778 + 0.7777777778 + -0.3333333333x + x2 = 0 + 0.7777777778

Combine like terms: -0.7777777778 + 0.7777777778 = 0.0000000000
0.0000000000 + -0.3333333333x + x2 = 0 + 0.7777777778
-0.3333333333x + x2 = 0 + 0.7777777778

Combine like terms: 0 + 0.7777777778 = 0.7777777778
-0.3333333333x + x2 = 0.7777777778

The x term is -0.3333333333x.  Take half its coefficient (-0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
-0.3333333333x + 0.02777777779 + x2 = 0.7777777778 + 0.02777777779

Reorder the terms:
0.02777777779 + -0.3333333333x + x2 = 0.7777777778 + 0.02777777779

Combine like terms: 0.7777777778 + 0.02777777779 = 0.80555555559
0.02777777779 + -0.3333333333x + x2 = 0.80555555559

Factor a perfect square on the left side:
(x + -0.1666666667)(x + -0.1666666667) = 0.80555555559

Calculate the square root of the right side: 0.897527468

Break this problem into two subproblems by setting 
(x + -0.1666666667) equal to 0.897527468 and -0.897527468.


Subproblem 1
x + -0.1666666667 = 0.897527468

Simplifying
x + -0.1666666667 = 0.897527468

Reorder the terms:
-0.1666666667 + x = 0.897527468

Solving
-0.1666666667 + x = 0.897527468

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.1666666667' to each side of the equation.
-0.1666666667 + 0.1666666667 + x = 0.897527468 + 0.1666666667

Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000
0.0000000000 + x = 0.897527468 + 0.1666666667
x = 0.897527468 + 0.1666666667

Combine like terms: 0.897527468 + 0.1666666667 = 1.0641941347
x = 1.0641941347

Simplifying
x = 1.0641941347


Subproblem 2
x + -0.1666666667 = -0.897527468

Simplifying
x + -0.1666666667 = -0.897527468

Reorder the terms:
-0.1666666667 + x = -0.897527468

Solving
-0.1666666667 + x = -0.897527468

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.1666666667' to each side of the equation.
-0.1666666667 + 0.1666666667 + x = -0.897527468 + 0.1666666667

Combine like terms: -0.1666666667 + 0.1666666667 = 0.0000000000
0.0000000000 + x = -0.897527468 + 0.1666666667
x = -0.897527468 + 0.1666666667

Combine like terms: -0.897527468 + 0.1666666667 = -0.7308608013
x = -0.7308608013

Simplifying
x = -0.7308608013


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.0641941347, -0.7308608013}

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