6.1 ANSWERS normal 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 

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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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