z^2-2z+12=0

Solution for z^2-2z+12=0 equation:

Simplifying
z2 + -2z + 12 = 0

Reorder the terms:
12 + -2z + z2 = 0

Solving
12 + -2z + z2 = 0

Solving for variable 'z'.

Begin completing the square.

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -2z + -12 + z2 = 0 + -12

Reorder the terms:
12 + -12 + -2z + z2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -2z + z2 = 0 + -12
-2z + z2 = 0 + -12

Combine like terms: 0 + -12 = -12
-2z + z2 = -12

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

Add '1' to each side of the equation.
-2z + 1 + z2 = -12 + 1

Reorder the terms:
1 + -2z + z2 = -12 + 1

Combine like terms: -12 + 1 = -11
1 + -2z + z2 = -11

Factor a perfect square on the left side:
(z + -1)(z + -1) = -11

Can't calculate square root of the right side.

The solution to this equation could not be determined.