D^2-2D+5=0

Solution for D^2-2D+5=0 equation:

Simplifying
D2 + -2D + 5 = 0

Reorder the terms:
5 + -2D + D2 = 0

Solving
5 + -2D + D2 = 0

Solving for variable 'D'.

Begin completing the square.

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -2D + -5 + D2 = 0 + -5

Reorder the terms:
5 + -5 + -2D + D2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -2D + D2 = 0 + -5
-2D + D2 = 0 + -5

Combine like terms: 0 + -5 = -5
-2D + D2 = -5

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

Add '1' to each side of the equation.
-2D + 1 + D2 = -5 + 1

Reorder the terms:
1 + -2D + D2 = -5 + 1

Combine like terms: -5 + 1 = -4
1 + -2D + D2 = -4

Factor a perfect square on the left side:
(D + -1)(D + -1) = -4

Can't calculate square root of the right side.

The solution to this equation could not be determined.