Question

I need help with number 16

Answer 1

You are correct

for example f(1) = 3

and   f(2) = f(2-1) - 2

= f(1) - 2

= 3 - 2 = 1

Answer 2

f(n) = f(n-1) - 2

f(1) = 3        eq1

f(2) = f(2-1) - 2

     = f(1) - 2.   put value from eq1 here

     = 3 - 2

     = 1

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

     = f(2) - 2

     = 1 - 2

     = -1

f(4) = f( 4 -1 ) - 2

     = f( 3 ) - 2

     =  -1 - 2

     = -3

3,1,-1,-3