Question

1. By repeated subtraction of odd numbers starting from 1, find whether the following numbers are perfect squares or not? If the number is a perfect square then find its square root:
(1) 121
(ii) 55
(iii) 36
(iv) 90​

Answer 1

Answer:

90 -1=89

89-3=86

86-5=81

81-7=74

74-9=65

65-11=54

54-13=41

41-15=26

26-17=9

° ° it's value is not zero therefore 90 is not a perfect square

Answer 2

Answer:

36 - 1= 35

35 - 3 = 32

32 - 5 = 27

27 - 7 = 20

20 - 9 = 11

11 - 11 = 0

It is a perfect square.

It's square root is 6

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