x^2-13x-22=0

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Solution for x^2-13x-22=0 equation:


Simplifying
x2 + -13x + -22 = 0

Reorder the terms:
-22 + -13x + x2 = 0

Solving
-22 + -13x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '22' to each side of the equation.
-22 + -13x + 22 + x2 = 0 + 22

Reorder the terms:
-22 + 22 + -13x + x2 = 0 + 22

Combine like terms: -22 + 22 = 0
0 + -13x + x2 = 0 + 22
-13x + x2 = 0 + 22

Combine like terms: 0 + 22 = 22
-13x + x2 = 22

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 = 22 + 42.25

Reorder the terms:
42.25 + -13x + x2 = 22 + 42.25

Combine like terms: 22 + 42.25 = 64.25
42.25 + -13x + x2 = 64.25

Factor a perfect square on the left side:
(x + -6.5)(x + -6.5) = 64.25

Calculate the square root of the right side: 8.015609771

Break this problem into two subproblems by setting 
(x + -6.5) equal to 8.015609771 and -8.015609771.

Subproblem 1

x + -6.5 = 8.015609771 Simplifying x + -6.5 = 8.015609771 Reorder the terms: -6.5 + x = 8.015609771 Solving -6.5 + x = 8.015609771 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 = 8.015609771 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = 8.015609771 + 6.5 x = 8.015609771 + 6.5 Combine like terms: 8.015609771 + 6.5 = 14.515609771 x = 14.515609771 Simplifying x = 14.515609771

Subproblem 2

x + -6.5 = -8.015609771 Simplifying x + -6.5 = -8.015609771 Reorder the terms: -6.5 + x = -8.015609771 Solving -6.5 + x = -8.015609771 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 = -8.015609771 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = -8.015609771 + 6.5 x = -8.015609771 + 6.5 Combine like terms: -8.015609771 + 6.5 = -1.515609771 x = -1.515609771 Simplifying x = -1.515609771

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.515609771, -1.515609771}

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