x^2-8x-24=20

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Solution for x^2-8x-24=20 equation:


Simplifying
x2 + -8x + -24 = 20

Reorder the terms:
-24 + -8x + x2 = 20

Solving
-24 + -8x + x2 = 20

Solving for variable 'x'.

Reorder the terms:
-24 + -20 + -8x + x2 = 20 + -20

Combine like terms: -24 + -20 = -44
-44 + -8x + x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-44 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '44' to each side of the equation.
-44 + -8x + 44 + x2 = 0 + 44

Reorder the terms:
-44 + 44 + -8x + x2 = 0 + 44

Combine like terms: -44 + 44 = 0
0 + -8x + x2 = 0 + 44
-8x + x2 = 0 + 44

Combine like terms: 0 + 44 = 44
-8x + x2 = 44

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 = 44 + 16

Reorder the terms:
16 + -8x + x2 = 44 + 16

Combine like terms: 44 + 16 = 60
16 + -8x + x2 = 60

Factor a perfect square on the left side:
(x + -4)(x + -4) = 60

Calculate the square root of the right side: 7.745966692

Break this problem into two subproblems by setting 
(x + -4) equal to 7.745966692 and -7.745966692.

Subproblem 1

x + -4 = 7.745966692 Simplifying x + -4 = 7.745966692 Reorder the terms: -4 + x = 7.745966692 Solving -4 + x = 7.745966692 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 = 7.745966692 + 4 Combine like terms: -4 + 4 = 0 0 + x = 7.745966692 + 4 x = 7.745966692 + 4 Combine like terms: 7.745966692 + 4 = 11.745966692 x = 11.745966692 Simplifying x = 11.745966692

Subproblem 2

x + -4 = -7.745966692 Simplifying x + -4 = -7.745966692 Reorder the terms: -4 + x = -7.745966692 Solving -4 + x = -7.745966692 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 = -7.745966692 + 4 Combine like terms: -4 + 4 = 0 0 + x = -7.745966692 + 4 x = -7.745966692 + 4 Combine like terms: -7.745966692 + 4 = -3.745966692 x = -3.745966692 Simplifying x = -3.745966692

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.745966692, -3.745966692}

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