x^2+2x=10300

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Solution for x^2+2x=10300 equation:


Simplifying
x2 + 2x = 10300

Reorder the terms:
2x + x2 = 10300

Solving
2x + x2 = 10300

Solving for variable 'x'.

Reorder the terms:
-10300 + 2x + x2 = 10300 + -10300

Combine like terms: 10300 + -10300 = 0
-10300 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '10300' to each side of the equation.
-10300 + 2x + 10300 + x2 = 0 + 10300

Reorder the terms:
-10300 + 10300 + 2x + x2 = 0 + 10300

Combine like terms: -10300 + 10300 = 0
0 + 2x + x2 = 0 + 10300
2x + x2 = 0 + 10300

Combine like terms: 0 + 10300 = 10300
2x + x2 = 10300

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 = 10300 + 1

Reorder the terms:
1 + 2x + x2 = 10300 + 1

Combine like terms: 10300 + 1 = 10301
1 + 2x + x2 = 10301

Factor a perfect square on the left side:
(x + 1)(x + 1) = 10301

Calculate the square root of the right side: 101.493842178

Break this problem into two subproblems by setting 
(x + 1) equal to 101.493842178 and -101.493842178.

Subproblem 1

x + 1 = 101.493842178 Simplifying x + 1 = 101.493842178 Reorder the terms: 1 + x = 101.493842178 Solving 1 + x = 101.493842178 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 = 101.493842178 + -1 Combine like terms: 1 + -1 = 0 0 + x = 101.493842178 + -1 x = 101.493842178 + -1 Combine like terms: 101.493842178 + -1 = 100.493842178 x = 100.493842178 Simplifying x = 100.493842178

Subproblem 2

x + 1 = -101.493842178 Simplifying x + 1 = -101.493842178 Reorder the terms: 1 + x = -101.493842178 Solving 1 + x = -101.493842178 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 = -101.493842178 + -1 Combine like terms: 1 + -1 = 0 0 + x = -101.493842178 + -1 x = -101.493842178 + -1 Combine like terms: -101.493842178 + -1 = -102.493842178 x = -102.493842178 Simplifying x = -102.493842178

Solution

The solution to the problem is based on the solutions from the subproblems. x = {100.493842178, -102.493842178}

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