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EmmaH
Group Title
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..
 one year ago
 one year ago
EmmaH Group Title
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..
 one year ago
 one year ago

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JayDS Group TitleBest ResponseYou've already chosen the best response.0
Do you know the crab claw/Foil method to expand out the brackets?
 one year ago

ZeHanz Group TitleBest ResponseYou've already chosen the best response.2
This is the form: (ab)(a+b) = a²b². It pays to learn this form by heart, so you can recognise them immediately when you see one!
 one year ago

precal Group TitleBest ResponseYou've already chosen the best response.0
this is a difference of squares as ZeHanz stated
 one year ago

JayDS Group TitleBest ResponseYou've already chosen the best response.0
yes it is indeed but she can easily get the answer if she expands the brackets and collect like terms as well.
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
ii got the answer usinmg foil which is 9a^2+ (121)
 one year ago

ZeHanz Group TitleBest ResponseYou've already chosen the best response.2
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)(3p4q). See: sum and difference of the same two numbers, so the answer is (3p)²(4q)²=9p²16q². You can save so much (spare) time with this...
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
but my answermy answer possiblities are 9a2  22 9a2  121 9a2 + 121 9a2  66a + 121
 one year ago

JayDS Group TitleBest ResponseYou've already chosen the best response.0
The answer you got from FOILING is correct, 9a^2+ (121). but one thing, you forgot that +  becomes  9a^2 121
 one year ago

JayDS Group TitleBest ResponseYou've already chosen the best response.0
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.
 one year ago

EmmaH Group TitleBest ResponseYou've already chosen the best response.0
thank you peoples!
 one year ago

precal Group TitleBest ResponseYou've already chosen the best response.0
never use double signsdw:1359206802362:dw
 one year ago
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