How do you evaluate the function $f (x) = 4 • 7^x$ for x = -1 and x = 2?

Question

7468 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-05-08T12:30:54

See details below

Given $f(x)=4·7^x$

For $x=-1$ we have $f(-1)=4·7^(-1)=4/7$ using $a^(-n)=1/a^n$

For x=2, we have $f(2)=4·7^2=196$

How do you evaluate the function f (x) = 4 • 7^xf (x) = 4 • 7^x for x = -1 and x = 2?