Question

Evaluate : 9^0 + 9^-1 – 9^-2 + 9^1/2 – 9^-1/2

Answer 1

Answer:

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Step-by-step explanation:

${9}^{0} + {9}^{ - 1} - {9}^{ - 2} + {9}^{ \frac{1}{2} } - {9}^{ \frac{ - 1}{2} } \\ = > 1 + \frac{1}{9} - \frac{1}{81} + 3 - \frac{1}{3} \\ = > take \: lcm \\ = > \frac{81 + 9 - 1 + 243 - 27}{81} \\ = > \frac{305}{81}$