x^2+2x+6=313

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Solution for x^2+2x+6=313 equation:


Simplifying
x2 + 2x + 6 = 313

Reorder the terms:
6 + 2x + x2 = 313

Solving
6 + 2x + x2 = 313

Solving for variable 'x'.

Reorder the terms:
6 + -313 + 2x + x2 = 313 + -313

Combine like terms: 6 + -313 = -307
-307 + 2x + x2 = 313 + -313

Combine like terms: 313 + -313 = 0
-307 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '307' to each side of the equation.
-307 + 2x + 307 + x2 = 0 + 307

Reorder the terms:
-307 + 307 + 2x + x2 = 0 + 307

Combine like terms: -307 + 307 = 0
0 + 2x + x2 = 0 + 307
2x + x2 = 0 + 307

Combine like terms: 0 + 307 = 307
2x + x2 = 307

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 = 307 + 1

Reorder the terms:
1 + 2x + x2 = 307 + 1

Combine like terms: 307 + 1 = 308
1 + 2x + x2 = 308

Factor a perfect square on the left side:
(x + 1)(x + 1) = 308

Calculate the square root of the right side: 17.549928775

Break this problem into two subproblems by setting 
(x + 1) equal to 17.549928775 and -17.549928775.

Subproblem 1

x + 1 = 17.549928775 Simplifying x + 1 = 17.549928775 Reorder the terms: 1 + x = 17.549928775 Solving 1 + x = 17.549928775 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 = 17.549928775 + -1 Combine like terms: 1 + -1 = 0 0 + x = 17.549928775 + -1 x = 17.549928775 + -1 Combine like terms: 17.549928775 + -1 = 16.549928775 x = 16.549928775 Simplifying x = 16.549928775

Subproblem 2

x + 1 = -17.549928775 Simplifying x + 1 = -17.549928775 Reorder the terms: 1 + x = -17.549928775 Solving 1 + x = -17.549928775 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 = -17.549928775 + -1 Combine like terms: 1 + -1 = 0 0 + x = -17.549928775 + -1 x = -17.549928775 + -1 Combine like terms: -17.549928775 + -1 = -18.549928775 x = -18.549928775 Simplifying x = -18.549928775

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.549928775, -18.549928775}

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