Find the coefficient of the
b
7
z
2
\displaystyle {b}^{{7}}{z}^{{2}}
b
7
z
2
term in the expansion of
(
b
+
z
)
9
\displaystyle {\left({b}+{z}\right)}^{{9}}
(
b
+
z
)
9
.
In the expansion,
(
b
+
z
)
9
=
b
9
+
…
+
\displaystyle {\left({b}+{z}\right)}^{{9}}={b}^{{9}}+\ldots+
(
b
+
z
)
9
=
b
9
+
…
+
b
7
z
2
+
…
+
z
9
\displaystyle {b}^{{7}}{z}^{{2}}+\ldots+{z}^{{9}}
b
7
z
2
+
…
+
z
9
(Enter ONLY the coefficient)
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