COMP 2711 Ex 2

1

a

For $z=1,z^2+6z+10=17<20$

The statement is false

b

For $z<0,z^2-z>0$
For $z=0,z^2-z=0$
For $z>0,z^2-z\ge 0$

The statement is true

c

For $z=1,z-z^2=0$
For $z>1,z-z^2<0$

The statement is false

d

For $z=3,z^2-z=6$

The statement is true