anonymous
  • 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..
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
Do you know the crab claw/Foil method to expand out the brackets?
ZeHanz
  • 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
  • precal
this is a difference of squares as ZeHanz stated

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anonymous
  • anonymous
yes it is indeed but she can easily get the answer if she expands the brackets and collect like terms as well.
anonymous
  • anonymous
ii got the answer usinmg foil which is 9a^2+ (-121)
ZeHanz
  • 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
  • anonymous
but my answermy answer possiblities are 9a2 - 22 9a2 - 121 9a2 + 121 9a2 - 66a + 121
anonymous
  • anonymous
The answer you got from FOILING is correct, 9a^2+ (-121). but one thing, you forgot that + - becomes - 9a^2 -121
anonymous
  • 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
  • anonymous
thank you peoples!
ZeHanz
  • ZeHanz
Welcome!
precal
  • precal
never use double signs|dw:1359206802362:dw|

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