Question

Evaluate 9^3/2 -3(5)^0 -(1/81)^-1/2​

Answer 1

9^3/2 - 3[ 5 ]^0 - (1/81^-1/2

= 321

Answer 2

${9}^{ \frac{3}{2} } - 3 {(5)}^{0} - { (\frac{1}{81}) }^{ - \frac{ 1}{2} } \\ \\ = 27 - 3 \times 1 - {( \frac{81}{1}) }^{ \frac{1}{2} } \\ \\ = 24 - 9 \\ \\ \underline{ = 15}$