If f(x) = 3(2)^x, find f(-1)

Question

Math, And I give up on this problem

 

Answer 1

f(x) is the name of the function, and "x" is a number that can be anything. However, when we write something like f(-1), that means that every time we see an "x" in f(x), we will replace the "x" with -1.

 

f(-1) = 3(2)^(-1)

 

Note: Negative exponents mean that we will move the number to the opposite side of the fraction. Ex. 2^(-1) = 1/2, 1/(2^(-1)) = 2.

 

f(-1) = 3 * 1/2

f(-1) = 3/2