Posted by Rae Rae on Sunday, April 5, 2009 at 4:44pm.
The last one which you were asking where the b came from I typed the wrong problem sorry.
the problem is 49a^2b^2
Is the answer: (7+ab)(7ab)

Algebra correction  Damon, Sunday, April 5, 2009 at 4:47pm
(7ab)(7+ab)
the difference of two squares
(sqrt first + sqrt second)(sqrt first  sqrt second)

Algebra correction  Damon, Sunday, April 5, 2009 at 4:50pm
Check these by multiplying them out.

Algebra correction  Reiny, Sunday, April 5, 2009 at 4:51pm
How about answering your own question.
will I get 49a^2b^2 if I simplify (7+ab)(7ab) ??
now try (7 + ab)(7  ab)

Thank you:):):)  Rae Rae, Sunday, April 5, 2009 at 4:52pm
Thank you now I understand how to check them to see if there right. Thanks Damon, and thanks Reiny.
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