9x^2+x-22=0

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Solution for 9x^2+x-22=0 equation:


Simplifying
9x2 + x + -22 = 0

Reorder the terms:
-22 + x + 9x2 = 0

Solving
-22 + x + 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'.
-2.444444444 + 0.1111111111x + x2 = 0

Move the constant term to the right:

Add '2.444444444' to each side of the equation.
-2.444444444 + 0.1111111111x + 2.444444444 + x2 = 0 + 2.444444444

Reorder the terms:
-2.444444444 + 2.444444444 + 0.1111111111x + x2 = 0 + 2.444444444

Combine like terms: -2.444444444 + 2.444444444 = 0.000000000
0.000000000 + 0.1111111111x + x2 = 0 + 2.444444444
0.1111111111x + x2 = 0 + 2.444444444

Combine like terms: 0 + 2.444444444 = 2.444444444
0.1111111111x + x2 = 2.444444444

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.1111111111x + 0.25 + x2 = 2.444444444 + 0.25

Reorder the terms:
0.25 + 0.1111111111x + x2 = 2.444444444 + 0.25

Combine like terms: 2.444444444 + 0.25 = 2.694444444
0.25 + 0.1111111111x + x2 = 2.694444444

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 2.694444444

Calculate the square root of the right side: 1.6414763

Break this problem into two subproblems by setting 
(x + 0.5) equal to 1.6414763 and -1.6414763.

Subproblem 1

x + 0.5 = 1.6414763 Simplifying x + 0.5 = 1.6414763 Reorder the terms: 0.5 + x = 1.6414763 Solving 0.5 + x = 1.6414763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 1.6414763 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 1.6414763 + -0.5 x = 1.6414763 + -0.5 Combine like terms: 1.6414763 + -0.5 = 1.1414763 x = 1.1414763 Simplifying x = 1.1414763

Subproblem 2

x + 0.5 = -1.6414763 Simplifying x + 0.5 = -1.6414763 Reorder the terms: 0.5 + x = -1.6414763 Solving 0.5 + x = -1.6414763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -1.6414763 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -1.6414763 + -0.5 x = -1.6414763 + -0.5 Combine like terms: -1.6414763 + -0.5 = -2.1414763 x = -2.1414763 Simplifying x = -2.1414763

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1414763, -2.1414763}

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