x^2+14x-311=0

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Solution for x^2+14x-311=0 equation:


Simplifying
x2 + 14x + -311 = 0

Reorder the terms:
-311 + 14x + x2 = 0

Solving
-311 + 14x + 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 + 14x + 311 + x2 = 0 + 311

Reorder the terms:
-311 + 311 + 14x + x2 = 0 + 311

Combine like terms: -311 + 311 = 0
0 + 14x + x2 = 0 + 311
14x + x2 = 0 + 311

Combine like terms: 0 + 311 = 311
14x + x2 = 311

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = 311 + 49

Reorder the terms:
49 + 14x + x2 = 311 + 49

Combine like terms: 311 + 49 = 360
49 + 14x + x2 = 360

Factor a perfect square on the left side:
(x + 7)(x + 7) = 360

Calculate the square root of the right side: 18.973665961

Break this problem into two subproblems by setting 
(x + 7) equal to 18.973665961 and -18.973665961.

Subproblem 1

x + 7 = 18.973665961 Simplifying x + 7 = 18.973665961 Reorder the terms: 7 + x = 18.973665961 Solving 7 + x = 18.973665961 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 18.973665961 + -7 Combine like terms: 7 + -7 = 0 0 + x = 18.973665961 + -7 x = 18.973665961 + -7 Combine like terms: 18.973665961 + -7 = 11.973665961 x = 11.973665961 Simplifying x = 11.973665961

Subproblem 2

x + 7 = -18.973665961 Simplifying x + 7 = -18.973665961 Reorder the terms: 7 + x = -18.973665961 Solving 7 + x = -18.973665961 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -18.973665961 + -7 Combine like terms: 7 + -7 = 0 0 + x = -18.973665961 + -7 x = -18.973665961 + -7 Combine like terms: -18.973665961 + -7 = -25.973665961 x = -25.973665961 Simplifying x = -25.973665961

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.973665961, -25.973665961}

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