x^2-8x-4000=0

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Solution for x^2-8x-4000=0 equation:


Simplifying
x2 + -8x + -4000 = 0

Reorder the terms:
-4000 + -8x + x2 = 0

Solving
-4000 + -8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '4000' to each side of the equation.
-4000 + -8x + 4000 + x2 = 0 + 4000

Reorder the terms:
-4000 + 4000 + -8x + x2 = 0 + 4000

Combine like terms: -4000 + 4000 = 0
0 + -8x + x2 = 0 + 4000
-8x + x2 = 0 + 4000

Combine like terms: 0 + 4000 = 4000
-8x + x2 = 4000

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 = 4000 + 16

Reorder the terms:
16 + -8x + x2 = 4000 + 16

Combine like terms: 4000 + 16 = 4016
16 + -8x + x2 = 4016

Factor a perfect square on the left side:
(x + -4)(x + -4) = 4016

Calculate the square root of the right side: 63.371918071

Break this problem into two subproblems by setting 
(x + -4) equal to 63.371918071 and -63.371918071.

Subproblem 1

x + -4 = 63.371918071 Simplifying x + -4 = 63.371918071 Reorder the terms: -4 + x = 63.371918071 Solving -4 + x = 63.371918071 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 = 63.371918071 + 4 Combine like terms: -4 + 4 = 0 0 + x = 63.371918071 + 4 x = 63.371918071 + 4 Combine like terms: 63.371918071 + 4 = 67.371918071 x = 67.371918071 Simplifying x = 67.371918071

Subproblem 2

x + -4 = -63.371918071 Simplifying x + -4 = -63.371918071 Reorder the terms: -4 + x = -63.371918071 Solving -4 + x = -63.371918071 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 = -63.371918071 + 4 Combine like terms: -4 + 4 = 0 0 + x = -63.371918071 + 4 x = -63.371918071 + 4 Combine like terms: -63.371918071 + 4 = -59.371918071 x = -59.371918071 Simplifying x = -59.371918071

Solution

The solution to the problem is based on the solutions from the subproblems. x = {67.371918071, -59.371918071}

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