tell me the answer of this question
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given
a^2 + 1/a^2 = 81/16
a^2 + 1/a^2 -2 +2 = 81/16
(a - 1/a )^2 + 2 = 81/16
( a - 1/a)^2 = (81/ 16) - 2
(a -1/a)^2 = (81 - 32)/ 16 = 49/16
therefore
( a- 1/ a)^2 = 49/ 16
taking square root both sides
a - 1/a = 7/4 = 1.75 option 4 is correct
a - 1/a = 7/4 = 1.75 option 4 is correct
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