x^2+2x=869

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Solution for x^2+2x=869 equation:


Simplifying
x2 + 2x = 869

Reorder the terms:
2x + x2 = 869

Solving
2x + x2 = 869

Solving for variable 'x'.

Reorder the terms:
-869 + 2x + x2 = 869 + -869

Combine like terms: 869 + -869 = 0
-869 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '869' to each side of the equation.
-869 + 2x + 869 + x2 = 0 + 869

Reorder the terms:
-869 + 869 + 2x + x2 = 0 + 869

Combine like terms: -869 + 869 = 0
0 + 2x + x2 = 0 + 869
2x + x2 = 0 + 869

Combine like terms: 0 + 869 = 869
2x + x2 = 869

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 = 869 + 1

Reorder the terms:
1 + 2x + x2 = 869 + 1

Combine like terms: 869 + 1 = 870
1 + 2x + x2 = 870

Factor a perfect square on the left side:
(x + 1)(x + 1) = 870

Calculate the square root of the right side: 29.495762408

Break this problem into two subproblems by setting 
(x + 1) equal to 29.495762408 and -29.495762408.

Subproblem 1

x + 1 = 29.495762408 Simplifying x + 1 = 29.495762408 Reorder the terms: 1 + x = 29.495762408 Solving 1 + x = 29.495762408 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 = 29.495762408 + -1 Combine like terms: 1 + -1 = 0 0 + x = 29.495762408 + -1 x = 29.495762408 + -1 Combine like terms: 29.495762408 + -1 = 28.495762408 x = 28.495762408 Simplifying x = 28.495762408

Subproblem 2

x + 1 = -29.495762408 Simplifying x + 1 = -29.495762408 Reorder the terms: 1 + x = -29.495762408 Solving 1 + x = -29.495762408 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 = -29.495762408 + -1 Combine like terms: 1 + -1 = 0 0 + x = -29.495762408 + -1 x = -29.495762408 + -1 Combine like terms: -29.495762408 + -1 = -30.495762408 x = -30.495762408 Simplifying x = -30.495762408

Solution

The solution to the problem is based on the solutions from the subproblems. x = {28.495762408, -30.495762408}

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