x^2+9x=24

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Solution for x^2+9x=24 equation:


Simplifying
x2 + 9x = 24

Reorder the terms:
9x + x2 = 24

Solving
9x + x2 = 24

Solving for variable 'x'.

Reorder the terms:
-24 + 9x + x2 = 24 + -24

Combine like terms: 24 + -24 = 0
-24 + 9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + 9x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + 9x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + 9x + x2 = 0 + 24
9x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
9x + x2 = 24

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 24 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 24 + 20.25

Combine like terms: 24 + 20.25 = 44.25
20.25 + 9x + x2 = 44.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 44.25

Calculate the square root of the right side: 6.652067348

Break this problem into two subproblems by setting 
(x + 4.5) equal to 6.652067348 and -6.652067348.

Subproblem 1

x + 4.5 = 6.652067348 Simplifying x + 4.5 = 6.652067348 Reorder the terms: 4.5 + x = 6.652067348 Solving 4.5 + x = 6.652067348 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 6.652067348 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 6.652067348 + -4.5 x = 6.652067348 + -4.5 Combine like terms: 6.652067348 + -4.5 = 2.152067348 x = 2.152067348 Simplifying x = 2.152067348

Subproblem 2

x + 4.5 = -6.652067348 Simplifying x + 4.5 = -6.652067348 Reorder the terms: 4.5 + x = -6.652067348 Solving 4.5 + x = -6.652067348 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -6.652067348 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -6.652067348 + -4.5 x = -6.652067348 + -4.5 Combine like terms: -6.652067348 + -4.5 = -11.152067348 x = -11.152067348 Simplifying x = -11.152067348

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.152067348, -11.152067348}

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