x^2-256x+15=0

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Solution for x^2-256x+15=0 equation:


Simplifying
x2 + -256x + 15 = 0

Reorder the terms:
15 + -256x + x2 = 0

Solving
15 + -256x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-15' to each side of the equation.
15 + -256x + -15 + x2 = 0 + -15

Reorder the terms:
15 + -15 + -256x + x2 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + -256x + x2 = 0 + -15
-256x + x2 = 0 + -15

Combine like terms: 0 + -15 = -15
-256x + x2 = -15

The x term is -256x.  Take half its coefficient (-128).
Square it (16384) and add it to both sides.

Add '16384' to each side of the equation.
-256x + 16384 + x2 = -15 + 16384

Reorder the terms:
16384 + -256x + x2 = -15 + 16384

Combine like terms: -15 + 16384 = 16369
16384 + -256x + x2 = 16369

Factor a perfect square on the left side:
(x + -128)(x + -128) = 16369

Calculate the square root of the right side: 127.941392833

Break this problem into two subproblems by setting 
(x + -128) equal to 127.941392833 and -127.941392833.

Subproblem 1

x + -128 = 127.941392833 Simplifying x + -128 = 127.941392833 Reorder the terms: -128 + x = 127.941392833 Solving -128 + x = 127.941392833 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '128' to each side of the equation. -128 + 128 + x = 127.941392833 + 128 Combine like terms: -128 + 128 = 0 0 + x = 127.941392833 + 128 x = 127.941392833 + 128 Combine like terms: 127.941392833 + 128 = 255.941392833 x = 255.941392833 Simplifying x = 255.941392833

Subproblem 2

x + -128 = -127.941392833 Simplifying x + -128 = -127.941392833 Reorder the terms: -128 + x = -127.941392833 Solving -128 + x = -127.941392833 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '128' to each side of the equation. -128 + 128 + x = -127.941392833 + 128 Combine like terms: -128 + 128 = 0 0 + x = -127.941392833 + 128 x = -127.941392833 + 128 Combine like terms: -127.941392833 + 128 = 0.058607167 x = 0.058607167 Simplifying x = 0.058607167

Solution

The solution to the problem is based on the solutions from the subproblems. x = {255.941392833, 0.058607167}

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