Write a rule for the following functions

Question

20.x)-1,0,1,2

Y)1,3,9,27

 

21.x)-1,0,1,2

Y)3,1,1/3,1/9

Answer 1

you have to try to figure things out

 

the y values in problem 20 are the successive powers of 3, so how about y = 3^x+1

Does this work for every x?

 

Now try to imagine, create, invent a formula for the y's in problem 2.  If I hand you another answer, you will not have learned to experiment and test the validity of a theory.