Question

Show that
u0 +
n C1u1x +
n C2u2x
2 + · · · + unx
n = (1 + x)
nu0 +
n C1(1 + x)
n−1x∆u0
+
nC2(1 + x)
n−2x
2∆
2u0 + · · · + x
n∆
nu0.

Answer 1

Answer:

which language is this? I can't understand..