Solve the quadratic equation by completing the square: `z^2-4z+41 = 105` 

Give the equation after completing the square, but before taking the square root. Your answer should look like: `(z-a)^2=b` 
The equation is:   

List all solutions to the equation in simplest radical form, separated by commas. The solutions are: 

`z =`   

Get help: Video

Box 1: Enter your answer as an equation. Example: y=3x^2+1, 2+x+y=3
Be sure your variables match those in the question

Box 2: Enter your answer as a list of values separated by commas: Example: -4, 3, 2
Enter each value as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity
Decimal values are not allowed