Question

If a-1/a=3,find the value of a^2-1/a^2

Answer 1

${a}^{2} - \frac{1}{ {a}^{2} } \\ {(a - \frac{1}{a} )}^{2} + 2.a. \frac{1}{a} \\ {(3)}^{2} + 2 \\ 9 + 2 \\ 11$