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Start with the given expression.
Expand. Remember something like
.
Now let's FOIL the expression.
Remember, when you FOIL an expression, you follow this procedure:
Multiply the
First terms:
.
Multiply the
Outer terms:
.
Multiply the
Inner terms:
.
Multiply the
Last terms:
.
---------------------------------------------------
So we have the terms:
,
,
,
Now add every term listed above to make a single expression.
Now combine like terms.
So
FOILs to
.
In other words,
.
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