Need help graded assignment

Question

if f(1)=6 and f(n)=-4f(n-1) + 1 then find the value of f(4)

Answer 1

f(4) = 4f(3)+1

f(3) = 4f(2) + 1

f(2) = 4f(1) + 1 = 6+1 = 7

f(3) =4(7)+1 = 29

f(4) = 4(29)+1 = 116+1 = 117