s^2-4s+20=0

Solution for s^2-4s+20=0 equation:

Simplifying
s2 + -4s + 20 = 0

Reorder the terms:
20 + -4s + s2 = 0

Solving
20 + -4s + s2 = 0

Solving for variable 's'.

Begin completing the square.

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + -4s + -20 + s2 = 0 + -20

Reorder the terms:
20 + -20 + -4s + s2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + -4s + s2 = 0 + -20
-4s + s2 = 0 + -20

Combine like terms: 0 + -20 = -20
-4s + s2 = -20

The s term is -4s.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4s + 4 + s2 = -20 + 4

Reorder the terms:
4 + -4s + s2 = -20 + 4

Combine like terms: -20 + 4 = -16
4 + -4s + s2 = -16

Factor a perfect square on the left side:
(s + -2)(s + -2) = -16

Can't calculate square root of the right side.

The solution to this equation could not be determined.