x^2+4x-256=0

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Solution for x^2+4x-256=0 equation:


Simplifying
x2 + 4x + -256 = 0

Reorder the terms:
-256 + 4x + x2 = 0

Solving
-256 + 4x + 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 + 4x + 256 + x2 = 0 + 256

Reorder the terms:
-256 + 256 + 4x + x2 = 0 + 256

Combine like terms: -256 + 256 = 0
0 + 4x + x2 = 0 + 256
4x + x2 = 0 + 256

Combine like terms: 0 + 256 = 256
4x + x2 = 256

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 256 + 4

Reorder the terms:
4 + 4x + x2 = 256 + 4

Combine like terms: 256 + 4 = 260
4 + 4x + x2 = 260

Factor a perfect square on the left side:
(x + 2)(x + 2) = 260

Calculate the square root of the right side: 16.124515497

Break this problem into two subproblems by setting 
(x + 2) equal to 16.124515497 and -16.124515497.

Subproblem 1

x + 2 = 16.124515497 Simplifying x + 2 = 16.124515497 Reorder the terms: 2 + x = 16.124515497 Solving 2 + x = 16.124515497 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 16.124515497 + -2 Combine like terms: 2 + -2 = 0 0 + x = 16.124515497 + -2 x = 16.124515497 + -2 Combine like terms: 16.124515497 + -2 = 14.124515497 x = 14.124515497 Simplifying x = 14.124515497

Subproblem 2

x + 2 = -16.124515497 Simplifying x + 2 = -16.124515497 Reorder the terms: 2 + x = -16.124515497 Solving 2 + x = -16.124515497 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -16.124515497 + -2 Combine like terms: 2 + -2 = 0 0 + x = -16.124515497 + -2 x = -16.124515497 + -2 Combine like terms: -16.124515497 + -2 = -18.124515497 x = -18.124515497 Simplifying x = -18.124515497

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.124515497, -18.124515497}

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