Question 168494
a. {{{x^2-1}}} x is natural numbers
b.{{{x[n]=x[n-1] + (2n+1)}}} where {{{x[0]=10}}} 1st term, n is natural numbers
c {{{x[n]=x[n-1] +  (4n+2)}}} where {{{x[0]=2}}} 1st term, n is natural numbers
d.{{{x^3}}} where x is the natural numbers