Simplify (3y + 7)² – (3y – 7)²
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1
Answer:
Rewrite
(
3
y
+
7
)
2
as
(
3
y
+
7
)
(
3
y
+
7
)
.
(
3
y
+
7
)
(
3
y
+
7
)
Expand
(
3
y
+
7
)
(
3
y
+
7
)
using the FOIL Method.
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3
y
(
3
y
)
+
3
y
⋅
7
+
7
(
3
y
)
+
7
⋅
7
Simplify and combine like terms.
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9
y
2
+
42
y
+
49
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