f(2)
f(2) = x + 1
f(2) = 3
f(3) = 2(x + 4)
f(3) = 14
f(4) = 5 (x)
f(4) = 20
f(2) = x - 0
f(2) = 2
f(3) = 2(x - 1)
f(3) = 4
f(4) = -5(x)
f(4) = -20
f(2) = x + 7
f(2) = 9
f(3) = 4(x - 2)
f(3) = 4
f(4) = 12(x)
f(4) = 48
f(2) = x + 10
f(2) = 12
f(3) = 4(x + 5)
f(3) = 32
f(4) = 7(x)
f(4) = 28
f(2) = x + 5
f(2) = 7
f(3) = 5(x + 6)
f(3) = 45
f(4) = 10(x)
f(4) = 40