Asked by Rae Rae

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)
Answered by Damon
(7-ab)(7+ab)

the difference of two squares
(sqrt first + sqrt second)(sqrt first - sqrt second)
Answered by Damon
Check these by multiplying them out.
Answered by Reiny
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)
Answered by Rae Rae
Thank you now I understand how to check them to see if there right. Thanks Damon, and thanks Reiny.
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