9x+x^2=225

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Solution for 9x+x^2=225 equation:


Simplifying
9x + x2 = 225

Solving
9x + x2 = 225

Solving for variable 'x'.

Reorder the terms:
-225 + 9x + x2 = 225 + -225

Combine like terms: 225 + -225 = 0
-225 + 9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '225' to each side of the equation.
-225 + 9x + 225 + x2 = 0 + 225

Reorder the terms:
-225 + 225 + 9x + x2 = 0 + 225

Combine like terms: -225 + 225 = 0
0 + 9x + x2 = 0 + 225
9x + x2 = 0 + 225

Combine like terms: 0 + 225 = 225
9x + x2 = 225

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 225 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 225 + 20.25

Combine like terms: 225 + 20.25 = 245.25
20.25 + 9x + x2 = 245.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 245.25

Calculate the square root of the right side: 15.660459763

Break this problem into two subproblems by setting 
(x + 4.5) equal to 15.660459763 and -15.660459763.

Subproblem 1

x + 4.5 = 15.660459763 Simplifying x + 4.5 = 15.660459763 Reorder the terms: 4.5 + x = 15.660459763 Solving 4.5 + x = 15.660459763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 15.660459763 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 15.660459763 + -4.5 x = 15.660459763 + -4.5 Combine like terms: 15.660459763 + -4.5 = 11.160459763 x = 11.160459763 Simplifying x = 11.160459763

Subproblem 2

x + 4.5 = -15.660459763 Simplifying x + 4.5 = -15.660459763 Reorder the terms: 4.5 + x = -15.660459763 Solving 4.5 + x = -15.660459763 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -15.660459763 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -15.660459763 + -4.5 x = -15.660459763 + -4.5 Combine like terms: -15.660459763 + -4.5 = -20.160459763 x = -20.160459763 Simplifying x = -20.160459763

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.160459763, -20.160459763}

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