x^2-16x-312=0

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Solution for x^2-16x-312=0 equation:


Simplifying
x2 + -16x + -312 = 0

Reorder the terms:
-312 + -16x + x2 = 0

Solving
-312 + -16x + 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 + -16x + 312 + x2 = 0 + 312

Reorder the terms:
-312 + 312 + -16x + x2 = 0 + 312

Combine like terms: -312 + 312 = 0
0 + -16x + x2 = 0 + 312
-16x + x2 = 0 + 312

Combine like terms: 0 + 312 = 312
-16x + x2 = 312

The x term is -16x.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x + 64 + x2 = 312 + 64

Reorder the terms:
64 + -16x + x2 = 312 + 64

Combine like terms: 312 + 64 = 376
64 + -16x + x2 = 376

Factor a perfect square on the left side:
(x + -8)(x + -8) = 376

Calculate the square root of the right side: 19.39071943

Break this problem into two subproblems by setting 
(x + -8) equal to 19.39071943 and -19.39071943.

Subproblem 1

x + -8 = 19.39071943 Simplifying x + -8 = 19.39071943 Reorder the terms: -8 + x = 19.39071943 Solving -8 + x = 19.39071943 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = 19.39071943 + 8 Combine like terms: -8 + 8 = 0 0 + x = 19.39071943 + 8 x = 19.39071943 + 8 Combine like terms: 19.39071943 + 8 = 27.39071943 x = 27.39071943 Simplifying x = 27.39071943

Subproblem 2

x + -8 = -19.39071943 Simplifying x + -8 = -19.39071943 Reorder the terms: -8 + x = -19.39071943 Solving -8 + x = -19.39071943 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = -19.39071943 + 8 Combine like terms: -8 + 8 = 0 0 + x = -19.39071943 + 8 x = -19.39071943 + 8 Combine like terms: -19.39071943 + 8 = -11.39071943 x = -11.39071943 Simplifying x = -11.39071943

Solution

The solution to the problem is based on the solutions from the subproblems. x = {27.39071943, -11.39071943}

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