equations

Question 1

quadratic recursive

Answer 1

f(n)=f(n-1)+1st diff+2nd diff(n-1)

Question 2

exponential explicit

Answer 2

f(n)=f(1)(r^x-1) [for example: if 25,75,225 then it’s * by 3 = 3 is r]
or f(n)=f(0)(r^x)

Question 3

exponential recursive

Answer 3

f(1)=1st term
f(n)=f(n-1)*r

Question 4

linear explicit

Answer 4

f(n)=f(1)+(n-1)d (d is rate of change)

Question 5

linear recursive

Answer 5

f(1)=1st term
f(n)=d+f(n-1)