Question

plzz answer this fast...

Answer 1

${8a}^{3} + \frac{ {b}^{3} }{64}$
$= {(2a + \frac{b}{4} )}^{3} - 3 \times 2a \times \frac{b}{4} (2a + \frac{b}{4} )$
$= {5}^{3} - \frac{3 \times 4 \times 5}{2}$
$= 125 - 30$
$= 95$