10.1 example equations

X^2=-17
√17, √-17

(k+5)^2=-100
√-100
-5+√10
-5,-10

2r^2-4r+1=0
2r^2+4r=-1x4
-2x2=4

3z^2-6z-2-0
3z^2=2+9
z=3+√11/3