Question

how do you evaluate f(x) at the given values of x
f(x)=x^1/4 x=81,-3

Answer 1

x=-3 is not in the domain of f

Answer 2

f(81)=81^1/4=(3^4)^1/4=3

Answer 3

\[\Large f(x) = x^{\frac{1}{4}}\]


\[\Large f(81) = 81^{\frac{1}{4}}\]


\[\Large f(81) = \sqrt[4]{81}\]


\[\Large f(81) = \sqrt[4]{3^4}\]


\[\Large f(81) = 3\]


As for the other value, you cannot take the fourth root of a negative number.