x^2-18x-24=0

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Solution for x^2-18x-24=0 equation:


Simplifying
x2 + -18x + -24 = 0

Reorder the terms:
-24 + -18x + x2 = 0

Solving
-24 + -18x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + -18x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + -18x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + -18x + x2 = 0 + 24
-18x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
-18x + x2 = 24

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = 24 + 81

Reorder the terms:
81 + -18x + x2 = 24 + 81

Combine like terms: 24 + 81 = 105
81 + -18x + x2 = 105

Factor a perfect square on the left side:
(x + -9)(x + -9) = 105

Calculate the square root of the right side: 10.246950766

Break this problem into two subproblems by setting 
(x + -9) equal to 10.246950766 and -10.246950766.

Subproblem 1

x + -9 = 10.246950766 Simplifying x + -9 = 10.246950766 Reorder the terms: -9 + x = 10.246950766 Solving -9 + x = 10.246950766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 10.246950766 + 9 Combine like terms: -9 + 9 = 0 0 + x = 10.246950766 + 9 x = 10.246950766 + 9 Combine like terms: 10.246950766 + 9 = 19.246950766 x = 19.246950766 Simplifying x = 19.246950766

Subproblem 2

x + -9 = -10.246950766 Simplifying x + -9 = -10.246950766 Reorder the terms: -9 + x = -10.246950766 Solving -9 + x = -10.246950766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -10.246950766 + 9 Combine like terms: -9 + 9 = 0 0 + x = -10.246950766 + 9 x = -10.246950766 + 9 Combine like terms: -10.246950766 + 9 = -1.246950766 x = -1.246950766 Simplifying x = -1.246950766

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.246950766, -1.246950766}

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