Question

help me solve both questions with the full solutions please...​

Answer 1

a2 + 9/a2 = 31

=> a2 + 9/a2 - 6 = 31 - 6

=> a2 + 9/a2 - 2.3/a.a= 25

=> (a + 3/a)2= 25

=> (a + 3/a)= + 5

Hope it helps,

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