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 49-a^2b^2

Is the answer: (7+ab)-(7ab)

- Algebra correction -
**Damon**, Sunday, April 5, 2009 at 4:47pm
(7-ab)(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 49-a^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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