Question

(
x
+
a
)
n
=
∑
n
k
=
0
(
n
k
)
x
k
a
n
−
k

Answer 1

Answer:

Nice question

Step-by-step explanation:

(

x

+

a

)

n

=

∑

n

k

=

0

(

n

k

)

x

k

a

n

−

k