Question

find the value of 4x81-½(81½+81⅔)

Answer 1

483.859 is the answer ok

Answer 2

$4 \times (\frac{1}{81} )^{ \frac{1}{2} } ( \sqrt{81} + \sqrt[3]{81 \times 81}$
$4 \times \frac{1}{9} (9 + 9 \sqrt[3]{9} )$
$4 \times \frac{1}{9} \times 9 \times (1 + \sqrt[3]{9} )$
4×(1+3√9)
4±4×2.080
4+8.160
12.160