Question

f(x)=x³-64/x³-16=12,for x=4​

Answer 1

$f(x) = \frac{ {x}^{3} - 64}{ {x}^{3} - 16 } \\ \\ f(4) = \frac{ {4}^{3} - 64}{ {4}^{3} - 16 } \\ \\ f(4) = \frac{ 64 - 64}{ 64 - 16 } \\ \\ f(4) = \frac{0}{ 48 } \\ \\ f(x) = 0$

Hope it helps !