x^2+2x=6460

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Solution for x^2+2x=6460 equation:


Simplifying
x2 + 2x = 6460

Reorder the terms:
2x + x2 = 6460

Solving
2x + x2 = 6460

Solving for variable 'x'.

Reorder the terms:
-6460 + 2x + x2 = 6460 + -6460

Combine like terms: 6460 + -6460 = 0
-6460 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '6460' to each side of the equation.
-6460 + 2x + 6460 + x2 = 0 + 6460

Reorder the terms:
-6460 + 6460 + 2x + x2 = 0 + 6460

Combine like terms: -6460 + 6460 = 0
0 + 2x + x2 = 0 + 6460
2x + x2 = 0 + 6460

Combine like terms: 0 + 6460 = 6460
2x + x2 = 6460

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 = 6460 + 1

Reorder the terms:
1 + 2x + x2 = 6460 + 1

Combine like terms: 6460 + 1 = 6461
1 + 2x + x2 = 6461

Factor a perfect square on the left side:
(x + 1)(x + 1) = 6461

Calculate the square root of the right side: 80.380345856

Break this problem into two subproblems by setting 
(x + 1) equal to 80.380345856 and -80.380345856.

Subproblem 1

x + 1 = 80.380345856 Simplifying x + 1 = 80.380345856 Reorder the terms: 1 + x = 80.380345856 Solving 1 + x = 80.380345856 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 = 80.380345856 + -1 Combine like terms: 1 + -1 = 0 0 + x = 80.380345856 + -1 x = 80.380345856 + -1 Combine like terms: 80.380345856 + -1 = 79.380345856 x = 79.380345856 Simplifying x = 79.380345856

Subproblem 2

x + 1 = -80.380345856 Simplifying x + 1 = -80.380345856 Reorder the terms: 1 + x = -80.380345856 Solving 1 + x = -80.380345856 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 = -80.380345856 + -1 Combine like terms: 1 + -1 = 0 0 + x = -80.380345856 + -1 x = -80.380345856 + -1 Combine like terms: -80.380345856 + -1 = -81.380345856 x = -81.380345856 Simplifying x = -81.380345856

Solution

The solution to the problem is based on the solutions from the subproblems. x = {79.380345856, -81.380345856}

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