x^2+13x-176=0

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Solution for x^2+13x-176=0 equation:


Simplifying
x2 + 13x + -176 = 0

Reorder the terms:
-176 + 13x + x2 = 0

Solving
-176 + 13x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '176' to each side of the equation.
-176 + 13x + 176 + x2 = 0 + 176

Reorder the terms:
-176 + 176 + 13x + x2 = 0 + 176

Combine like terms: -176 + 176 = 0
0 + 13x + x2 = 0 + 176
13x + x2 = 0 + 176

Combine like terms: 0 + 176 = 176
13x + x2 = 176

The x term is 13x.  Take half its coefficient (6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
13x + 42.25 + x2 = 176 + 42.25

Reorder the terms:
42.25 + 13x + x2 = 176 + 42.25

Combine like terms: 176 + 42.25 = 218.25
42.25 + 13x + x2 = 218.25

Factor a perfect square on the left side:
(x + 6.5)(x + 6.5) = 218.25

Calculate the square root of the right side: 14.773286703

Break this problem into two subproblems by setting 
(x + 6.5) equal to 14.773286703 and -14.773286703.

Subproblem 1

x + 6.5 = 14.773286703 Simplifying x + 6.5 = 14.773286703 Reorder the terms: 6.5 + x = 14.773286703 Solving 6.5 + x = 14.773286703 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + x = 14.773286703 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = 14.773286703 + -6.5 x = 14.773286703 + -6.5 Combine like terms: 14.773286703 + -6.5 = 8.273286703 x = 8.273286703 Simplifying x = 8.273286703

Subproblem 2

x + 6.5 = -14.773286703 Simplifying x + 6.5 = -14.773286703 Reorder the terms: 6.5 + x = -14.773286703 Solving 6.5 + x = -14.773286703 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.5' to each side of the equation. 6.5 + -6.5 + x = -14.773286703 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = -14.773286703 + -6.5 x = -14.773286703 + -6.5 Combine like terms: -14.773286703 + -6.5 = -21.273286703 x = -21.273286703 Simplifying x = -21.273286703

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.273286703, -21.273286703}

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