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- anonymous

Multiply: (3a + 11)(3a - 11).
9a2 - 22
9a2 - 121
9a2 + 121
9a2 - 66a + 121
i know its either b or c but i donmt knwo which it is..

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- anonymous

- katieb

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- anonymous

Do you know the crab claw/Foil method to expand out the brackets?

- ZeHanz

This is the form: (a-b)(a+b) = a²-b².
It pays to learn this form by heart, so you can recognise them immediately when you see one!

- precal

this is a difference of squares as ZeHanz stated

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- anonymous

yes it is indeed but she can easily get the answer if she expands the brackets and collect like terms as well.

- anonymous

ii got the answer usinmg foil which is 9a^2+ (-121)

- ZeHanz

FOILing is fine! It's just that in SOME cases, you don't need it, because you can see the answer right away.
This is such a special case.
Another one: (3p+4q)(3p-4q).
See: sum and difference of the same two numbers,
so the answer is (3p)²-(4q)²=9p²-16q².
You can save so much (spare) time with this...

- anonymous

but my answermy answer possiblities are 9a2 - 22
9a2 - 121
9a2 + 121
9a2 - 66a + 121

- anonymous

The answer you got from FOILING is correct, 9a^2+ (-121).
but one thing, you forgot that + - becomes -
9a^2 -121

- anonymous

Also note for special cases as these u should learn them, so u are able to identify them straight away just as @ZeHanz shows it.

- anonymous

thank you peoples!

- ZeHanz

Welcome!

- precal

never use double signs|dw:1359206802362:dw|

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