x^2-4x-1996=0

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Solution for x^2-4x-1996=0 equation:


Simplifying
x2 + -4x + -1996 = 0

Reorder the terms:
-1996 + -4x + x2 = 0

Solving
-1996 + -4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1996' to each side of the equation.
-1996 + -4x + 1996 + x2 = 0 + 1996

Reorder the terms:
-1996 + 1996 + -4x + x2 = 0 + 1996

Combine like terms: -1996 + 1996 = 0
0 + -4x + x2 = 0 + 1996
-4x + x2 = 0 + 1996

Combine like terms: 0 + 1996 = 1996
-4x + x2 = 1996

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 1996 + 4

Reorder the terms:
4 + -4x + x2 = 1996 + 4

Combine like terms: 1996 + 4 = 2000
4 + -4x + x2 = 2000

Factor a perfect square on the left side:
(x + -2)(x + -2) = 2000

Calculate the square root of the right side: 44.72135955

Break this problem into two subproblems by setting 
(x + -2) equal to 44.72135955 and -44.72135955.

Subproblem 1

x + -2 = 44.72135955 Simplifying x + -2 = 44.72135955 Reorder the terms: -2 + x = 44.72135955 Solving -2 + x = 44.72135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 44.72135955 + 2 Combine like terms: -2 + 2 = 0 0 + x = 44.72135955 + 2 x = 44.72135955 + 2 Combine like terms: 44.72135955 + 2 = 46.72135955 x = 46.72135955 Simplifying x = 46.72135955

Subproblem 2

x + -2 = -44.72135955 Simplifying x + -2 = -44.72135955 Reorder the terms: -2 + x = -44.72135955 Solving -2 + x = -44.72135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -44.72135955 + 2 Combine like terms: -2 + 2 = 0 0 + x = -44.72135955 + 2 x = -44.72135955 + 2 Combine like terms: -44.72135955 + 2 = -42.72135955 x = -42.72135955 Simplifying x = -42.72135955

Solution

The solution to the problem is based on the solutions from the subproblems. x = {46.72135955, -42.72135955}

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