Question

simplify f(-4)=2(3)^-4

Answer 1

remember pemdas, order of oepratons
also
$x^{-m}=\frac{1}{x^m}$

so

2(3)^-4 is 2 times 3^-4 so exponents first
$3^{-4}=\frac{1}{3^4}=\frac{1}{81}$
now we got
2 times 1/81=2/81

so $f(-4)=\frac{2}{81}$