Expand.
(
z
+
4
y
)
(
z
−
4
y
)
=
\displaystyle {\left({z}+{4}{y}\right)}{\left({z}-{4}{y}\right)}=
(
z
+
4
y
)
(
z
−
4
y
)
=
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Question 6
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\displaystyle
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