x^2+7x-107=0

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Solution for x^2+7x-107=0 equation:


Simplifying
x2 + 7x + -107 = 0

Reorder the terms:
-107 + 7x + x2 = 0

Solving
-107 + 7x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '107' to each side of the equation.
-107 + 7x + 107 + x2 = 0 + 107

Reorder the terms:
-107 + 107 + 7x + x2 = 0 + 107

Combine like terms: -107 + 107 = 0
0 + 7x + x2 = 0 + 107
7x + x2 = 0 + 107

Combine like terms: 0 + 107 = 107
7x + x2 = 107

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 107 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 107 + 12.25

Combine like terms: 107 + 12.25 = 119.25
12.25 + 7x + x2 = 119.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 119.25

Calculate the square root of the right side: 10.920164834

Break this problem into two subproblems by setting 
(x + 3.5) equal to 10.920164834 and -10.920164834.

Subproblem 1

x + 3.5 = 10.920164834 Simplifying x + 3.5 = 10.920164834 Reorder the terms: 3.5 + x = 10.920164834 Solving 3.5 + x = 10.920164834 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 10.920164834 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 10.920164834 + -3.5 x = 10.920164834 + -3.5 Combine like terms: 10.920164834 + -3.5 = 7.420164834 x = 7.420164834 Simplifying x = 7.420164834

Subproblem 2

x + 3.5 = -10.920164834 Simplifying x + 3.5 = -10.920164834 Reorder the terms: 3.5 + x = -10.920164834 Solving 3.5 + x = -10.920164834 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -10.920164834 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -10.920164834 + -3.5 x = -10.920164834 + -3.5 Combine like terms: -10.920164834 + -3.5 = -14.420164834 x = -14.420164834 Simplifying x = -14.420164834

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.420164834, -14.420164834}

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