x^2+5x-118=0

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Solution for x^2+5x-118=0 equation:


Simplifying
x2 + 5x + -118 = 0

Reorder the terms:
-118 + 5x + x2 = 0

Solving
-118 + 5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '118' to each side of the equation.
-118 + 5x + 118 + x2 = 0 + 118

Reorder the terms:
-118 + 118 + 5x + x2 = 0 + 118

Combine like terms: -118 + 118 = 0
0 + 5x + x2 = 0 + 118
5x + x2 = 0 + 118

Combine like terms: 0 + 118 = 118
5x + x2 = 118

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 118 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 118 + 6.25

Combine like terms: 118 + 6.25 = 124.25
6.25 + 5x + x2 = 124.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 124.25

Calculate the square root of the right side: 11.146748405

Break this problem into two subproblems by setting 
(x + 2.5) equal to 11.146748405 and -11.146748405.

Subproblem 1

x + 2.5 = 11.146748405 Simplifying x + 2.5 = 11.146748405 Reorder the terms: 2.5 + x = 11.146748405 Solving 2.5 + x = 11.146748405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 11.146748405 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 11.146748405 + -2.5 x = 11.146748405 + -2.5 Combine like terms: 11.146748405 + -2.5 = 8.646748405 x = 8.646748405 Simplifying x = 8.646748405

Subproblem 2

x + 2.5 = -11.146748405 Simplifying x + 2.5 = -11.146748405 Reorder the terms: 2.5 + x = -11.146748405 Solving 2.5 + x = -11.146748405 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -11.146748405 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -11.146748405 + -2.5 x = -11.146748405 + -2.5 Combine like terms: -11.146748405 + -2.5 = -13.646748405 x = -13.646748405 Simplifying x = -13.646748405

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.646748405, -13.646748405}

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