Posted by Rae Rae on .
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,
(7ab)(7+ab)
the difference of two squares
(sqrt first + sqrt second)(sqrt first  sqrt second) 
Algebra correction 
Damon,
Check these by multiplying them out.

Algebra correction 
Reiny,
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,
Thank you now I understand how to check them to see if there right. Thanks Damon, and thanks Reiny.