0=x^2-8x-24

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Solution for 0=x^2-8x-24 equation:


Simplifying
0 = x2 + -8x + -24

Reorder the terms:
0 = -24 + -8x + x2

Solving
0 = -24 + -8x + x2

Solving for variable 'x'.

Combine like terms: 0 + 24 = 24
24 + 8x + -1x2 = -24 + -8x + x2 + 24 + 8x + -1x2

Reorder the terms:
24 + 8x + -1x2 = -24 + 24 + -8x + 8x + x2 + -1x2

Combine like terms: -24 + 24 = 0
24 + 8x + -1x2 = 0 + -8x + 8x + x2 + -1x2
24 + 8x + -1x2 = -8x + 8x + x2 + -1x2

Combine like terms: -8x + 8x = 0
24 + 8x + -1x2 = 0 + x2 + -1x2
24 + 8x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
24 + 8x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-24 + -8x + x2 = 0

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + -8x + 24 + x2 = 0 + 24

Reorder the terms:
-24 + 24 + -8x + x2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + -8x + x2 = 0 + 24
-8x + x2 = 0 + 24

Combine like terms: 0 + 24 = 24
-8x + x2 = 24

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 24 + 16

Reorder the terms:
16 + -8x + x2 = 24 + 16

Combine like terms: 24 + 16 = 40
16 + -8x + x2 = 40

Factor a perfect square on the left side:
(x + -4)(x + -4) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(x + -4) equal to 6.32455532 and -6.32455532.

Subproblem 1

x + -4 = 6.32455532 Simplifying x + -4 = 6.32455532 Reorder the terms: -4 + x = 6.32455532 Solving -4 + x = 6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 6.32455532 + 4 Combine like terms: -4 + 4 = 0 0 + x = 6.32455532 + 4 x = 6.32455532 + 4 Combine like terms: 6.32455532 + 4 = 10.32455532 x = 10.32455532 Simplifying x = 10.32455532

Subproblem 2

x + -4 = -6.32455532 Simplifying x + -4 = -6.32455532 Reorder the terms: -4 + x = -6.32455532 Solving -4 + x = -6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -6.32455532 + 4 Combine like terms: -4 + 4 = 0 0 + x = -6.32455532 + 4 x = -6.32455532 + 4 Combine like terms: -6.32455532 + 4 = -2.32455532 x = -2.32455532 Simplifying x = -2.32455532

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.32455532, -2.32455532}

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