# Algebra correction

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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

• Algebra correction -

(7-ab)(7+ab)

the difference of two squares
(sqrt first + sqrt second)(sqrt first - sqrt second)

• Algebra correction -

Check these by multiplying them out.

• Algebra correction -

will I get 49-a^2b^2 if I simplify (7+ab)-(7ab) ??

now try (7 + ab)(7 - ab)

• Thank you:):):) -

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

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