x^2+10x-311=0

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Solution for x^2+10x-311=0 equation:


Simplifying
x2 + 10x + -311 = 0

Reorder the terms:
-311 + 10x + x2 = 0

Solving
-311 + 10x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '311' to each side of the equation.
-311 + 10x + 311 + x2 = 0 + 311

Reorder the terms:
-311 + 311 + 10x + x2 = 0 + 311

Combine like terms: -311 + 311 = 0
0 + 10x + x2 = 0 + 311
10x + x2 = 0 + 311

Combine like terms: 0 + 311 = 311
10x + x2 = 311

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 311 + 25

Reorder the terms:
25 + 10x + x2 = 311 + 25

Combine like terms: 311 + 25 = 336
25 + 10x + x2 = 336

Factor a perfect square on the left side:
(x + 5)(x + 5) = 336

Calculate the square root of the right side: 18.33030278

Break this problem into two subproblems by setting 
(x + 5) equal to 18.33030278 and -18.33030278.

Subproblem 1

x + 5 = 18.33030278 Simplifying x + 5 = 18.33030278 Reorder the terms: 5 + x = 18.33030278 Solving 5 + x = 18.33030278 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 18.33030278 + -5 Combine like terms: 5 + -5 = 0 0 + x = 18.33030278 + -5 x = 18.33030278 + -5 Combine like terms: 18.33030278 + -5 = 13.33030278 x = 13.33030278 Simplifying x = 13.33030278

Subproblem 2

x + 5 = -18.33030278 Simplifying x + 5 = -18.33030278 Reorder the terms: 5 + x = -18.33030278 Solving 5 + x = -18.33030278 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -18.33030278 + -5 Combine like terms: 5 + -5 = 0 0 + x = -18.33030278 + -5 x = -18.33030278 + -5 Combine like terms: -18.33030278 + -5 = -23.33030278 x = -23.33030278 Simplifying x = -23.33030278

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.33030278, -23.33030278}

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