2 √ 5 , 8 and √ 58 Explanation: given a complex number x + y i then the absolute value is ∙ x | x + y i | = √ x 2 + y 2 4 + 2 i has x = 4 and y = 2 ⇒ | 4 + 2 i | = √ 4 2 + 2 2 = √ 20 = 2 √ 5 8 i has x = 0 and y = 8 ⇒ | 8 i | = √ 0 2 + 8 2 = 8 − 3 + 7 i has x = − 3 and y = 7 ⇒ | − 3 + 7 i | = √ ( − 3 ) 2 + 7 2 = √ 58