x^2+13x=24

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Solution for x^2+13x=24 equation:


Simplifying
x2 + 13x = 24

Reorder the terms:
13x + x2 = 24

Solving
13x + x2 = 24

Solving for variable 'x'.

Reorder the terms:
-24 + 13x + x2 = 24 + -24

Combine like terms: 24 + -24 = 0
-24 + 13x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 13x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + 13x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 13x + x2 = 0 + 24
13x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
13x + x2 = 24

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 = 24 + 42.25

Reorder the terms:
42.25 + 13x + x2 = 24 + 42.25

Combine like terms: 24 + 42.25 = 66.25
42.25 + 13x + x2 = 66.25

Factor a perfect square on the left side:
(x + 6.5)(x + 6.5) = 66.25

Calculate the square root of the right side: 8.139410298

Break this problem into two subproblems by setting 
(x + 6.5) equal to 8.139410298 and -8.139410298.

Subproblem 1

x + 6.5 = 8.139410298 Simplifying x + 6.5 = 8.139410298 Reorder the terms: 6.5 + x = 8.139410298 Solving 6.5 + x = 8.139410298 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 = 8.139410298 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = 8.139410298 + -6.5 x = 8.139410298 + -6.5 Combine like terms: 8.139410298 + -6.5 = 1.639410298 x = 1.639410298 Simplifying x = 1.639410298

Subproblem 2

x + 6.5 = -8.139410298 Simplifying x + 6.5 = -8.139410298 Reorder the terms: 6.5 + x = -8.139410298 Solving 6.5 + x = -8.139410298 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 = -8.139410298 + -6.5 Combine like terms: 6.5 + -6.5 = 0.0 0.0 + x = -8.139410298 + -6.5 x = -8.139410298 + -6.5 Combine like terms: -8.139410298 + -6.5 = -14.639410298 x = -14.639410298 Simplifying x = -14.639410298

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.639410298, -14.639410298}

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