Question

Do This:
(1)
By subtraction of successive odd numbers find whether the following numbers
are perfect squares or not?
(1) 55 (i) 90 (ii) 121​

Answer 1

Answer:

121 is a perfect Square

55 & 90 are not

Step-by-step explanation:

55 -  1  = 54

54 - 3  = 51

51 - 5  = 46

46 - 7 = 39

39 - 9  = 30

30 -11 = 19

19 - 13 = 6

6 - 15 = -9

(not a perfect square)

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

9 - 19 = -10

(not a perfect square)

121  -  1  = 120

120  - 3  = 117

117  - 5  = 112

112 - 7   =  105

105  -9 = 96

96 - 11  = 85

85 - 13  = 72

72 - 15  = 57

57 - 17  = 40

40  - 19  = 21

21 - 21 = 0

121 is a perfect Square

Answer 2

Step-by-step explanation:

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