ABSOLUTE VALUE OF A COMPLEX NUMBER WORKSHEET

Absolute value of a complex number worksheet :

Here we are going to see some practice questions based on the concept finding absolute value of a complex number.

Absolute value of a complex number worksheet - Questions

Problem 1 :

Find the absolute value of 7 - i

Solution :

 |7 - i| = √(7² + (-1)²)

=  √(49 + 1) 

=  √50

=  √5 x 5 x 2

=  5 √2

Problem 2 :

Find the absolute value of -5 - 5i

Solution :

 |-5 - 5i| = √[(-5)² + (-5)²]

=  √25 + 25 

=  √50

=  √5 x 5 x 2

=  5 √2

Problem 3 :

Find the absolute value of 3 - 6i

Solution :

 |3 - 6i| = √3² + (-6)²

=  √9 + 36 

=  √45

=  √3 x 3 x 5

=  3 √5

Problem 4 :

Find the absolute value of 10 - 2i

Solution :

 |10 -2i| = √10² + (-2)²

=  √100 + 4 

=  √104

Problem 5 :

Find the absolute value of -4 - 8i

Solution :

 |-4 - 8i| = √(-4)² + (-8)²

=  √16 + 64 

=  √80

=  √2 x 2 x 2 x 2 x 5 = 4 √5

Problem 6 :

Find the absolute value of -4 + 10i

Solution :

 |-4 + 10i| = √(-4)² + 10²

=  √16 + 100 

=  √116

=  √2 x 2 x 29 = 2 √29

Problem 7 :

Find the absolute value of 1 - 8i

Solution :

 |1 - 8i| = √1² + (-8)²

=  √1 + 64

=  √65

Problem 8 :

Find the absolute value of -4 - 3i

Solution :

 |-4 - 3i| = √(-4)² + (-3)²

=  √16 + 9 

=  √25 ==> √5 x 5 ==> 5 

Problem 9 :

Find the absolute value of -1 + 5i

Solution :

 |-1 + 5i| = √(-1)² + 5²

=  √1 + 25 

=  √26

Problem 10 :

Find the absolute value of 8 - 3i

Solution :

 |8 - 3i| = √8² + (-3)²

=  √64 + 9 

=  √73

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