Question

this question is from 9th grade please solve the question best solution is marked as brainlist​

Answer 1

216 = 6³

256 = 4⁴

$\frac{4}{216^{\frac{-2}{3} } } - \frac{1}{256^{\frac{-3}{4} } } \\\\=\frac{4}{(6^3)^{\frac{-2}{3} } } - \frac{1}{(4^4)^{\frac{-3}{4} } } \\\\=\frac{4}{6^{-2} } - \frac{1}{4^{-3} }\\\\= 4\times6^2-4^3\\\\= 144-64\\\\= 80$