x^2-4x-1392=0

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Solution for x^2-4x-1392=0 equation:


Simplifying
x2 + -4x + -1392 = 0

Reorder the terms:
-1392 + -4x + x2 = 0

Solving
-1392 + -4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1392' to each side of the equation.
-1392 + -4x + 1392 + x2 = 0 + 1392

Reorder the terms:
-1392 + 1392 + -4x + x2 = 0 + 1392

Combine like terms: -1392 + 1392 = 0
0 + -4x + x2 = 0 + 1392
-4x + x2 = 0 + 1392

Combine like terms: 0 + 1392 = 1392
-4x + x2 = 1392

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 = 1392 + 4

Reorder the terms:
4 + -4x + x2 = 1392 + 4

Combine like terms: 1392 + 4 = 1396
4 + -4x + x2 = 1396

Factor a perfect square on the left side:
(x + -2)(x + -2) = 1396

Calculate the square root of the right side: 37.363083385

Break this problem into two subproblems by setting 
(x + -2) equal to 37.363083385 and -37.363083385.

Subproblem 1

x + -2 = 37.363083385 Simplifying x + -2 = 37.363083385 Reorder the terms: -2 + x = 37.363083385 Solving -2 + x = 37.363083385 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 = 37.363083385 + 2 Combine like terms: -2 + 2 = 0 0 + x = 37.363083385 + 2 x = 37.363083385 + 2 Combine like terms: 37.363083385 + 2 = 39.363083385 x = 39.363083385 Simplifying x = 39.363083385

Subproblem 2

x + -2 = -37.363083385 Simplifying x + -2 = -37.363083385 Reorder the terms: -2 + x = -37.363083385 Solving -2 + x = -37.363083385 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 = -37.363083385 + 2 Combine like terms: -2 + 2 = 0 0 + x = -37.363083385 + 2 x = -37.363083385 + 2 Combine like terms: -37.363083385 + 2 = -35.363083385 x = -35.363083385 Simplifying x = -35.363083385

Solution

The solution to the problem is based on the solutions from the subproblems. x = {39.363083385, -35.363083385}

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