Need help with this question

as below

Step-by-step explanation:

table x    y

         0 , 3

         1 ,  15

         2  ,  75

        3 , 375

f(x) = a     when x = zero then  what ever b =  is going to be 1  

so it's a*1=3   so a must be 3

next we know that when x = 1  then 3*b=15

b/ct anything raised to the power of one is it self... so

3*5=15   b=5  check the answer

3*=75

3*=375

this looks right  b = 5

it would to have a graph or something ! but i had this question so its false

step-by-step explanation: