x^2+2x-505=0

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Solution for x^2+2x-505=0 equation:


Simplifying
x2 + 2x + -505 = 0

Reorder the terms:
-505 + 2x + x2 = 0

Solving
-505 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '505' to each side of the equation.
-505 + 2x + 505 + x2 = 0 + 505

Reorder the terms:
-505 + 505 + 2x + x2 = 0 + 505

Combine like terms: -505 + 505 = 0
0 + 2x + x2 = 0 + 505
2x + x2 = 0 + 505

Combine like terms: 0 + 505 = 505
2x + x2 = 505

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 = 505 + 1

Reorder the terms:
1 + 2x + x2 = 505 + 1

Combine like terms: 505 + 1 = 506
1 + 2x + x2 = 506

Factor a perfect square on the left side:
(x + 1)(x + 1) = 506

Calculate the square root of the right side: 22.494443758

Break this problem into two subproblems by setting 
(x + 1) equal to 22.494443758 and -22.494443758.

Subproblem 1

x + 1 = 22.494443758 Simplifying x + 1 = 22.494443758 Reorder the terms: 1 + x = 22.494443758 Solving 1 + x = 22.494443758 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 = 22.494443758 + -1 Combine like terms: 1 + -1 = 0 0 + x = 22.494443758 + -1 x = 22.494443758 + -1 Combine like terms: 22.494443758 + -1 = 21.494443758 x = 21.494443758 Simplifying x = 21.494443758

Subproblem 2

x + 1 = -22.494443758 Simplifying x + 1 = -22.494443758 Reorder the terms: 1 + x = -22.494443758 Solving 1 + x = -22.494443758 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 = -22.494443758 + -1 Combine like terms: 1 + -1 = 0 0 + x = -22.494443758 + -1 x = -22.494443758 + -1 Combine like terms: -22.494443758 + -1 = -23.494443758 x = -23.494443758 Simplifying x = -23.494443758

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.494443758, -23.494443758}

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