Sharp EL-531LH Mastering Instructions page 15

12
Mastering the Calculator using the Sharp EL-531LH
Exercise 3
You can use this key for other powers as well. Try these examples
4
(a) 7
10
(b) 8
6
(c) (0.4) (you do not have to type the brackets in)
6
(d) (–7) (you do not need to type the brackets in)
0.4
(e) 5
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Answers:
(a) 2401
(b) 1073741824
(c) 4.096 × 10
–3
or 0.004096 (you move the decimal 3 places to the left)
(d)
(e) 1.903653939
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4.2 Square root
Finding the square root of a number 'undoes' or 'neutralises' the squaring of the number and
vice versa. The symbol for square root is
(This is called the radical sign)
The square root of 36 is written as
2
Now because 6 = 36,
Find the square root key on your calculator and type
The display will read 6.
What do you think 81
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You should have said 9 because 9
(Check your calculator)
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117649
36
36 = 6 .
is? 81 =
2
= 81