Question

[(81)¹/²+1][(81)¹/⁴-1]-20,Verify it.

Answer 1

=(9+1)(3-1)-20
=10×2-20
=20-20=0

Answer 2

$(( {81)}^{ \frac{1}{2} + 1} ) \: \: ( {(81)}^{ \frac{1}{4} - 1 } ) \: \: - 20 \\ \\ \\( \sqrt{81} + 1) \: \: ( \sqrt[4]{81} - 1) - 20 \\ \\ \\ (9 + 1)(3 - 1) - 20 \\ \\ \\ 10 \times 2 - 20 \\ \\ \\ 20 - 20 = 0$