i. 
= 0 ii. 
x + 3
= 0
iii. x2 + x + 
= 0 iv. x2 + 
= 0
i. = 0 ii. x + 3 = 0
iii. x2 + x + = 0 iv. x2 + = 0
= 0 ii. x + 3 = 0 iii. x2 + x +
= 0 iv. x2 + = 0
i.
= 0
x = 
= 
= 
ii. x + 3 = 0
x = 
= 
iii. x2 + x + = 0
= 0
x = 
= 
= 
iv. x2 + = 0
x2 + x + = 0
x =
=
= 
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(ii) z = -