225=x^2-2x

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Solution for 225=x^2-2x equation:


Simplifying
225 = x2 + -2x

Reorder the terms:
225 = -2x + x2

Solving
225 = -2x + x2

Solving for variable 'x'.

Reorder the terms:
225 + 2x + -1x2 = -2x + 2x + x2 + -1x2

Combine like terms: -2x + 2x = 0
225 + 2x + -1x2 = 0 + x2 + -1x2
225 + 2x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
225 + 2x + -1x2 = 0

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

Divide each side by '-1'.
-225 + -2x + x2 = 0

Move the constant term to the right:

Add '225' to each side of the equation.
-225 + -2x + 225 + x2 = 0 + 225

Reorder the terms:
-225 + 225 + -2x + x2 = 0 + 225

Combine like terms: -225 + 225 = 0
0 + -2x + x2 = 0 + 225
-2x + x2 = 0 + 225

Combine like terms: 0 + 225 = 225
-2x + x2 = 225

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 = 225 + 1

Reorder the terms:
1 + -2x + x2 = 225 + 1

Combine like terms: 225 + 1 = 226
1 + -2x + x2 = 226

Factor a perfect square on the left side:
(x + -1)(x + -1) = 226

Calculate the square root of the right side: 15.033296378

Break this problem into two subproblems by setting 
(x + -1) equal to 15.033296378 and -15.033296378.

Subproblem 1

x + -1 = 15.033296378 Simplifying x + -1 = 15.033296378 Reorder the terms: -1 + x = 15.033296378 Solving -1 + x = 15.033296378 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 = 15.033296378 + 1 Combine like terms: -1 + 1 = 0 0 + x = 15.033296378 + 1 x = 15.033296378 + 1 Combine like terms: 15.033296378 + 1 = 16.033296378 x = 16.033296378 Simplifying x = 16.033296378

Subproblem 2

x + -1 = -15.033296378 Simplifying x + -1 = -15.033296378 Reorder the terms: -1 + x = -15.033296378 Solving -1 + x = -15.033296378 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 = -15.033296378 + 1 Combine like terms: -1 + 1 = 0 0 + x = -15.033296378 + 1 x = -15.033296378 + 1 Combine like terms: -15.033296378 + 1 = -14.033296378 x = -14.033296378 Simplifying x = -14.033296378

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.033296378, -14.033296378}

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