x^2-2x=225

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


Simplifying
x2 + -2x = 225

Reorder the terms:
-2x + x2 = 225

Solving
-2x + x2 = 225

Solving for variable 'x'.

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

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

Begin completing the square.

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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