9x^2+18x=22

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Solution for 9x^2+18x=22 equation:


Simplifying
9x2 + 18x = 22

Reorder the terms:
18x + 9x2 = 22

Solving
18x + 9x2 = 22

Solving for variable 'x'.

Reorder the terms:
-22 + 18x + 9x2 = 22 + -22

Combine like terms: 22 + -22 = 0
-22 + 18x + 9x2 = 0

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

Divide each side by '9'.
-2.444444444 + 2x + x2 = 0

Move the constant term to the right:

Add '2.444444444' to each side of the equation.
-2.444444444 + 2x + 2.444444444 + x2 = 0 + 2.444444444

Reorder the terms:
-2.444444444 + 2.444444444 + 2x + x2 = 0 + 2.444444444

Combine like terms: -2.444444444 + 2.444444444 = 0.000000000
0.000000000 + 2x + x2 = 0 + 2.444444444
2x + x2 = 0 + 2.444444444

Combine like terms: 0 + 2.444444444 = 2.444444444
2x + x2 = 2.444444444

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 2.444444444 + 1

Reorder the terms:
1 + 2x + x2 = 2.444444444 + 1

Combine like terms: 2.444444444 + 1 = 3.444444444
1 + 2x + x2 = 3.444444444

Factor a perfect square on the left side:
(x + 1)(x + 1) = 3.444444444

Calculate the square root of the right side: 1.855921454

Break this problem into two subproblems by setting 
(x + 1) equal to 1.855921454 and -1.855921454.

Subproblem 1

x + 1 = 1.855921454 Simplifying x + 1 = 1.855921454 Reorder the terms: 1 + x = 1.855921454 Solving 1 + x = 1.855921454 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.855921454 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.855921454 + -1 x = 1.855921454 + -1 Combine like terms: 1.855921454 + -1 = 0.855921454 x = 0.855921454 Simplifying x = 0.855921454

Subproblem 2

x + 1 = -1.855921454 Simplifying x + 1 = -1.855921454 Reorder the terms: 1 + x = -1.855921454 Solving 1 + x = -1.855921454 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.855921454 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.855921454 + -1 x = -1.855921454 + -1 Combine like terms: -1.855921454 + -1 = -2.855921454 x = -2.855921454 Simplifying x = -2.855921454

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.855921454, -2.855921454}

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