x^2-16x-320=0

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Solution for x^2-16x-320=0 equation:


Simplifying
x2 + -16x + -320 = 0

Reorder the terms:
-320 + -16x + x2 = 0

Solving
-320 + -16x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '320' to each side of the equation.
-320 + -16x + 320 + x2 = 0 + 320

Reorder the terms:
-320 + 320 + -16x + x2 = 0 + 320

Combine like terms: -320 + 320 = 0
0 + -16x + x2 = 0 + 320
-16x + x2 = 0 + 320

Combine like terms: 0 + 320 = 320
-16x + x2 = 320

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 = 320 + 64

Reorder the terms:
64 + -16x + x2 = 320 + 64

Combine like terms: 320 + 64 = 384
64 + -16x + x2 = 384

Factor a perfect square on the left side:
(x + -8)(x + -8) = 384

Calculate the square root of the right side: 19.595917942

Break this problem into two subproblems by setting 
(x + -8) equal to 19.595917942 and -19.595917942.

Subproblem 1

x + -8 = 19.595917942 Simplifying x + -8 = 19.595917942 Reorder the terms: -8 + x = 19.595917942 Solving -8 + x = 19.595917942 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 = 19.595917942 + 8 Combine like terms: -8 + 8 = 0 0 + x = 19.595917942 + 8 x = 19.595917942 + 8 Combine like terms: 19.595917942 + 8 = 27.595917942 x = 27.595917942 Simplifying x = 27.595917942

Subproblem 2

x + -8 = -19.595917942 Simplifying x + -8 = -19.595917942 Reorder the terms: -8 + x = -19.595917942 Solving -8 + x = -19.595917942 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 = -19.595917942 + 8 Combine like terms: -8 + 8 = 0 0 + x = -19.595917942 + 8 x = -19.595917942 + 8 Combine like terms: -19.595917942 + 8 = -11.595917942 x = -11.595917942 Simplifying x = -11.595917942

Solution

The solution to the problem is based on the solutions from the subproblems. x = {27.595917942, -11.595917942}

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