6.1 ANSWERS normal path
Exercise 1
Calculate
a) 42 + 3 - 1
= 16 + 3 - 1
= 19 -1
= 18
b) 62 - 32
= 36 - 9
= 27
c) (7 - 6)2
= (1)2
= 1
d) (1/4)2 + (2/3)2
= 1/16 + 4/9
= 9/144 + 64/144
= 73/144
e) 7 - 62 : 3
= 7 - 36 : 3
= 7 - 12
= -5
Exercise 2:
Calculate
a) (-8)2
= -8 . -8
=64
b) √81
= 9
(because 9 . 9 = 81)
c) √49 + 42 - 1
= 7 + 42 - 1
= 7 + 16 - 1
= 22
d) 3 . √121 + 7 . √625
= 3 . 11 + 7 . 25
= 33 + 175
= 208