6.1 ANSWERS in-depth path 

Exercise 1

Calculate 

a) 4+ 3 - 1 

= 16 + 3 - 1 

= 19 -1 

= 18 

 

b) 62 - 32

= 36 - 9

= 27

 

c) (7 - 6)

= (1)

= 1 

 

d) (1/4)2 + (2/3)

= 1/16 + 4/9

= 9/144 + 64/144

= 73/144

 

e) 7 - 62 : 3 

= 7 - 36 : 3 

= 7 - 12 

= -5 

 

f) √49 + 42 - 1 

= 7 + 4- 1 

= 7 + 16 - 1 

= 22

 

g) 3 . √121 + 7 . √625

= 3  11 + 7 25

= 33 + 175

= 208 

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Exercise 2:

Calculate 

a) (-8)2

= -8 -8 

=64

 

b) √81

= 9 

(because 9 9 = 81)

 

c) √49 + 42 - 1 

= 7 + 4- 1 

= 7 + 16 - 1 

= 22

 

d) 3 . √121 + 7 . √625

= 3  11 + 7 25

= 33 + 175

= 208

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Exercise 3

Calculate 

a)√-7

= √( 7 -1 )

= √( 7 i)

= √7 √i 

= √7 

= i√7 

 

b) √( 9 - 10 ) 

= √-1 

= √i 

= i

 

c) 3√-13 + 5 . 2 

= 3 √( 13 -1 ) + 5 16 

= 3 √13  √i + 5 16 

= 3√13 i + 5 16 

= 3i√13 + 5 16 

= 3i√13 + 80 

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