325=9x+x^2

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Solution for 325=9x+x^2 equation:


Simplifying
325 = 9x + x2

Solving
325 = 9x + x2

Solving for variable 'x'.

Reorder the terms:
325 + -9x + -1x2 = 9x + -9x + x2 + -1x2

Combine like terms: 9x + -9x = 0
325 + -9x + -1x2 = 0 + x2 + -1x2
325 + -9x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
325 + -9x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-325 + 9x + x2 = 0

Move the constant term to the right:

Add '325' to each side of the equation.
-325 + 9x + 325 + x2 = 0 + 325

Reorder the terms:
-325 + 325 + 9x + x2 = 0 + 325

Combine like terms: -325 + 325 = 0
0 + 9x + x2 = 0 + 325
9x + x2 = 0 + 325

Combine like terms: 0 + 325 = 325
9x + x2 = 325

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 = 325 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 325 + 20.25

Combine like terms: 325 + 20.25 = 345.25
20.25 + 9x + x2 = 345.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 345.25

Calculate the square root of the right side: 18.580904176

Break this problem into two subproblems by setting 
(x + 4.5) equal to 18.580904176 and -18.580904176.

Subproblem 1

x + 4.5 = 18.580904176 Simplifying x + 4.5 = 18.580904176 Reorder the terms: 4.5 + x = 18.580904176 Solving 4.5 + x = 18.580904176 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 = 18.580904176 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 18.580904176 + -4.5 x = 18.580904176 + -4.5 Combine like terms: 18.580904176 + -4.5 = 14.080904176 x = 14.080904176 Simplifying x = 14.080904176

Subproblem 2

x + 4.5 = -18.580904176 Simplifying x + 4.5 = -18.580904176 Reorder the terms: 4.5 + x = -18.580904176 Solving 4.5 + x = -18.580904176 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 = -18.580904176 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -18.580904176 + -4.5 x = -18.580904176 + -4.5 Combine like terms: -18.580904176 + -4.5 = -23.080904176 x = -23.080904176 Simplifying x = -23.080904176

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.080904176, -23.080904176}

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