x^2-4x-312=0

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Solution for x^2-4x-312=0 equation:


Simplifying
x2 + -4x + -312 = 0

Reorder the terms:
-312 + -4x + x2 = 0

Solving
-312 + -4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '312' to each side of the equation.
-312 + -4x + 312 + x2 = 0 + 312

Reorder the terms:
-312 + 312 + -4x + x2 = 0 + 312

Combine like terms: -312 + 312 = 0
0 + -4x + x2 = 0 + 312
-4x + x2 = 0 + 312

Combine like terms: 0 + 312 = 312
-4x + x2 = 312

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 = 312 + 4

Reorder the terms:
4 + -4x + x2 = 312 + 4

Combine like terms: 312 + 4 = 316
4 + -4x + x2 = 316

Factor a perfect square on the left side:
(x + -2)(x + -2) = 316

Calculate the square root of the right side: 17.776388835

Break this problem into two subproblems by setting 
(x + -2) equal to 17.776388835 and -17.776388835.

Subproblem 1

x + -2 = 17.776388835 Simplifying x + -2 = 17.776388835 Reorder the terms: -2 + x = 17.776388835 Solving -2 + x = 17.776388835 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 = 17.776388835 + 2 Combine like terms: -2 + 2 = 0 0 + x = 17.776388835 + 2 x = 17.776388835 + 2 Combine like terms: 17.776388835 + 2 = 19.776388835 x = 19.776388835 Simplifying x = 19.776388835

Subproblem 2

x + -2 = -17.776388835 Simplifying x + -2 = -17.776388835 Reorder the terms: -2 + x = -17.776388835 Solving -2 + x = -17.776388835 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 = -17.776388835 + 2 Combine like terms: -2 + 2 = 0 0 + x = -17.776388835 + 2 x = -17.776388835 + 2 Combine like terms: -17.776388835 + 2 = -15.776388835 x = -15.776388835 Simplifying x = -15.776388835

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.776388835, -15.776388835}

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