x^2+2x=401.29

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Solution for x^2+2x=401.29 equation:


Simplifying
x2 + 2x = 401.29

Reorder the terms:
2x + x2 = 401.29

Solving
2x + x2 = 401.29

Solving for variable 'x'.

Reorder the terms:
-401.29 + 2x + x2 = 401.29 + -401.29

Combine like terms: 401.29 + -401.29 = 0.00
-401.29 + 2x + x2 = 0.00

Begin completing the square.

Move the constant term to the right:

Add '401.29' to each side of the equation.
-401.29 + 2x + 401.29 + x2 = 0.00 + 401.29

Reorder the terms:
-401.29 + 401.29 + 2x + x2 = 0.00 + 401.29

Combine like terms: -401.29 + 401.29 = 0.00
0.00 + 2x + x2 = 0.00 + 401.29
2x + x2 = 0.00 + 401.29

Combine like terms: 0.00 + 401.29 = 401.29
2x + x2 = 401.29

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 = 401.29 + 1

Reorder the terms:
1 + 2x + x2 = 401.29 + 1

Combine like terms: 401.29 + 1 = 402.29
1 + 2x + x2 = 402.29

Factor a perfect square on the left side:
(x + 1)(x + 1) = 402.29

Calculate the square root of the right side: 20.057168295

Break this problem into two subproblems by setting 
(x + 1) equal to 20.057168295 and -20.057168295.

Subproblem 1

x + 1 = 20.057168295 Simplifying x + 1 = 20.057168295 Reorder the terms: 1 + x = 20.057168295 Solving 1 + x = 20.057168295 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 = 20.057168295 + -1 Combine like terms: 1 + -1 = 0 0 + x = 20.057168295 + -1 x = 20.057168295 + -1 Combine like terms: 20.057168295 + -1 = 19.057168295 x = 19.057168295 Simplifying x = 19.057168295

Subproblem 2

x + 1 = -20.057168295 Simplifying x + 1 = -20.057168295 Reorder the terms: 1 + x = -20.057168295 Solving 1 + x = -20.057168295 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 = -20.057168295 + -1 Combine like terms: 1 + -1 = 0 0 + x = -20.057168295 + -1 x = -20.057168295 + -1 Combine like terms: -20.057168295 + -1 = -21.057168295 x = -21.057168295 Simplifying x = -21.057168295

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.057168295, -21.057168295}

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