Question

Find the value of f(-1) for the function below


`f(x) = (2)/(3) * 3(3x + 12)`
A. 19,683
B. 13,122
C. 512
D. 118,098

Answer 1

Put the value of x = -1 to the equation of a function f(x):

`f(x)=(2)/(3)*3^(3x+12)\\\\f(-1)=(2)/(3)*3^(3(-1)+12)=(2)/(3)*3^(-3+12)=(2)/(3)*3^9=(2)/(1)*3^8=13,122\to\boxed{B.}`