The value of is
ex . x5 + c
ex . x5 + ex + c
ex + 1 . x5 + c
5x4 . ex + c
B.
ex . x5 + ex + c
is
ex[x5 + 5x4 + 20x3 + 60x2 + 120x + 120] + C
ex[x5 - 5x4 - 20x3 - 60x2 - 120x - 120] + C
ex[x5 - 5x4 + 20x3 - 60x2 + 120x - 120] + C
ex[x5 + 5x4 + 20x3 - 60x2 - 120x + 120] + C