i need help with my homewrok PLEASE CHECK WORK number 3

Mr. Welsh
has a stating production of
f(1)=70
from the statement
He has determined that the production of eggs will increase each year to be the square of 60 eggs less than the previous year
previous year =fn
then
[tex](f_n-60)^2[/tex][tex]f_{n+1}=(f_n-60)^2[/tex]where
f(1)=70
then the correct answer is
option C