Question

If p+1/p=3 then find the value of 3(p²-1/p²)​

Answer 1

p+1/p = 12

=> (p+1/p)^2 = 144

=> p^2+(1/p)^2 +2(p)(1/p) = 144

=> p^2+1/p^2+2 = 144

=> p^2+1/p^2 = 142