y^2-2y+256=0

Solution for y^2-2y+256=0 equation:

Simplifying
y2 + -2y + 256 = 0

Reorder the terms:
256 + -2y + y2 = 0

Solving
256 + -2y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-256' to each side of the equation.
256 + -2y + -256 + y2 = 0 + -256

Reorder the terms:
256 + -256 + -2y + y2 = 0 + -256

Combine like terms: 256 + -256 = 0
0 + -2y + y2 = 0 + -256
-2y + y2 = 0 + -256

Combine like terms: 0 + -256 = -256
-2y + y2 = -256

The y term is -2y.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2y + 1 + y2 = -256 + 1

Reorder the terms:
1 + -2y + y2 = -256 + 1

Combine like terms: -256 + 1 = -255
1 + -2y + y2 = -255

Factor a perfect square on the left side:
(y + -1)(y + -1) = -255

Can't calculate square root of the right side.

The solution to this equation could not be determined.