Calculate the value of the trinomial [[$ P (x) = x ^ 3 + 2x ^ 2 +1 $]] when

a) [[$ x = 1 $]]

[[$ P(1) = $]]

b) [[$ x = -1 $]]

[[$ P(-1) = $]]

c) [[$ x = 2 $]]

[[$ P(2) = $]]

d) [[$ x = -3 $]]

[[$ P(-3) = $]]