Question

Prove that : $9^{\frac{3}{2}}-3\times 2^{\circ }-{\left(\frac{1}{81}\right)}^{\frac{1}{2}}=15$

Answer 1

$9^{\frac{3}{2}}-3\times 2^0-(\frac{1}{81}{)}^{-\frac{1}{2}}\Rightarrow (3^2{)}^{\frac{3}{2}}-3-(9^2{)}^{\frac{1}{2}}\Rightarrow 27-3-9\Rightarrow 15$