2x+261=x^2

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Solution for 2x+261=x^2 equation:


Simplifying
2x + 261 = x2

Reorder the terms:
261 + 2x = x2

Solving
261 + 2x = x2

Solving for variable 'x'.

Combine like terms: x2 + -1x2 = 0
261 + 2x + -1x2 = 0

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

Divide each side by '-1'.
-261 + -2x + x2 = 0

Move the constant term to the right:

Add '261' to each side of the equation.
-261 + -2x + 261 + x2 = 0 + 261

Reorder the terms:
-261 + 261 + -2x + x2 = 0 + 261

Combine like terms: -261 + 261 = 0
0 + -2x + x2 = 0 + 261
-2x + x2 = 0 + 261

Combine like terms: 0 + 261 = 261
-2x + x2 = 261

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 = 261 + 1

Reorder the terms:
1 + -2x + x2 = 261 + 1

Combine like terms: 261 + 1 = 262
1 + -2x + x2 = 262

Factor a perfect square on the left side:
(x + -1)(x + -1) = 262

Calculate the square root of the right side: 16.186414056

Break this problem into two subproblems by setting 
(x + -1) equal to 16.186414056 and -16.186414056.

Subproblem 1

x + -1 = 16.186414056 Simplifying x + -1 = 16.186414056 Reorder the terms: -1 + x = 16.186414056 Solving -1 + x = 16.186414056 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 = 16.186414056 + 1 Combine like terms: -1 + 1 = 0 0 + x = 16.186414056 + 1 x = 16.186414056 + 1 Combine like terms: 16.186414056 + 1 = 17.186414056 x = 17.186414056 Simplifying x = 17.186414056

Subproblem 2

x + -1 = -16.186414056 Simplifying x + -1 = -16.186414056 Reorder the terms: -1 + x = -16.186414056 Solving -1 + x = -16.186414056 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 = -16.186414056 + 1 Combine like terms: -1 + 1 = 0 0 + x = -16.186414056 + 1 x = -16.186414056 + 1 Combine like terms: -16.186414056 + 1 = -15.186414056 x = -15.186414056 Simplifying x = -15.186414056

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.186414056, -15.186414056}

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