x^2+2x-256=0

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Solution for x^2+2x-256=0 equation:


Simplifying
x2 + 2x + -256 = 0

Reorder the terms:
-256 + 2x + x2 = 0

Solving
-256 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '256' to each side of the equation.
-256 + 2x + 256 + x2 = 0 + 256

Reorder the terms:
-256 + 256 + 2x + x2 = 0 + 256

Combine like terms: -256 + 256 = 0
0 + 2x + x2 = 0 + 256
2x + x2 = 0 + 256

Combine like terms: 0 + 256 = 256
2x + x2 = 256

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 = 256 + 1

Reorder the terms:
1 + 2x + x2 = 256 + 1

Combine like terms: 256 + 1 = 257
1 + 2x + x2 = 257

Factor a perfect square on the left side:
(x + 1)(x + 1) = 257

Calculate the square root of the right side: 16.031219542

Break this problem into two subproblems by setting 
(x + 1) equal to 16.031219542 and -16.031219542.

Subproblem 1

x + 1 = 16.031219542 Simplifying x + 1 = 16.031219542 Reorder the terms: 1 + x = 16.031219542 Solving 1 + x = 16.031219542 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 = 16.031219542 + -1 Combine like terms: 1 + -1 = 0 0 + x = 16.031219542 + -1 x = 16.031219542 + -1 Combine like terms: 16.031219542 + -1 = 15.031219542 x = 15.031219542 Simplifying x = 15.031219542

Subproblem 2

x + 1 = -16.031219542 Simplifying x + 1 = -16.031219542 Reorder the terms: 1 + x = -16.031219542 Solving 1 + x = -16.031219542 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 = -16.031219542 + -1 Combine like terms: 1 + -1 = 0 0 + x = -16.031219542 + -1 x = -16.031219542 + -1 Combine like terms: -16.031219542 + -1 = -17.031219542 x = -17.031219542 Simplifying x = -17.031219542

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.031219542, -17.031219542}

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