x^2-24x-396=0

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Solution for x^2-24x-396=0 equation:


Simplifying
x2 + -24x + -396 = 0

Reorder the terms:
-396 + -24x + x2 = 0

Solving
-396 + -24x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '396' to each side of the equation.
-396 + -24x + 396 + x2 = 0 + 396

Reorder the terms:
-396 + 396 + -24x + x2 = 0 + 396

Combine like terms: -396 + 396 = 0
0 + -24x + x2 = 0 + 396
-24x + x2 = 0 + 396

Combine like terms: 0 + 396 = 396
-24x + x2 = 396

The x term is -24x.  Take half its coefficient (-12).
Square it (144) and add it to both sides.

Add '144' to each side of the equation.
-24x + 144 + x2 = 396 + 144

Reorder the terms:
144 + -24x + x2 = 396 + 144

Combine like terms: 396 + 144 = 540
144 + -24x + x2 = 540

Factor a perfect square on the left side:
(x + -12)(x + -12) = 540

Calculate the square root of the right side: 23.237900077

Break this problem into two subproblems by setting 
(x + -12) equal to 23.237900077 and -23.237900077.

Subproblem 1

x + -12 = 23.237900077 Simplifying x + -12 = 23.237900077 Reorder the terms: -12 + x = 23.237900077 Solving -12 + x = 23.237900077 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + x = 23.237900077 + 12 Combine like terms: -12 + 12 = 0 0 + x = 23.237900077 + 12 x = 23.237900077 + 12 Combine like terms: 23.237900077 + 12 = 35.237900077 x = 35.237900077 Simplifying x = 35.237900077

Subproblem 2

x + -12 = -23.237900077 Simplifying x + -12 = -23.237900077 Reorder the terms: -12 + x = -23.237900077 Solving -12 + x = -23.237900077 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + x = -23.237900077 + 12 Combine like terms: -12 + 12 = 0 0 + x = -23.237900077 + 12 x = -23.237900077 + 12 Combine like terms: -23.237900077 + 12 = -11.237900077 x = -11.237900077 Simplifying x = -11.237900077

Solution

The solution to the problem is based on the solutions from the subproblems. x = {35.237900077, -11.237900077}

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