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amorfide
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So it is time to ask a question of my own, i do not need an entire solution, just what the next step is
 2 years ago
 2 years ago
amorfide Group Title
So it is time to ask a question of my own, i do not need an entire solution, just what the next step is
 2 years ago
 2 years ago

This Question is Closed

amorfide Group TitleBest ResponseYou've already chosen the best response.0
dw:1350055553188:dw
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
find the values of A and B
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
i did the first step which gives me
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
dw:1350055629792:dw
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
not sure what to do next
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
@Callisto can you help?
 2 years ago

seashell Group TitleBest ResponseYou've already chosen the best response.0
@lgbasallote
 2 years ago

lgbasallote Group TitleBest ResponseYou've already chosen the best response.0
you tagged someone with an "i hate math" picture to a math question?
 2 years ago

Callisto Group TitleBest ResponseYou've already chosen the best response.0
Is it n(2n^2 + 3n 2) on the right side?
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
yeah it is
 2 years ago

Callisto Group TitleBest ResponseYou've already chosen the best response.0
dw:1350056495046:dw Can you simplify it first?
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
which side? left or right
 2 years ago

Callisto Group TitleBest ResponseYou've already chosen the best response.0
Both. There is a common factor.
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
dw:1350056560601:dw
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
that should be 2n on ther ight
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
dw:1350056701582:dw
 2 years ago

Callisto Group TitleBest ResponseYou've already chosen the best response.0
Not really.\[\frac{A}{6}n(n+1)(2n+1) +bn= n(n^2 + 3n 2)\]\[n[\frac{A}{6}(n+1)(2n+1)+b] = n(n^2 + 3n 2)\] Cancel the common factor. and expand the left side.
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
you could change b to 6b/6 and take out a factor of 1/6 right?
 2 years ago

Callisto Group TitleBest ResponseYou've already chosen the best response.0
You can, of course. But there is a common factor on both sides that you can cancel, what is it?
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
get rid of n on both sides? if not then i dont know waht the common factor is on both sides
 2 years ago

Callisto Group TitleBest ResponseYou've already chosen the best response.0
Yes! So, now, you get \[\frac{A}{6}(n+1)(2n+1)+b = n^2 + 3n 2\]So, expand the terms on the left. What do you get?
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
now i shall multiply out
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
dw:1350057038246:dw
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
forgot my A's
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
dw:1350057107864:dw
 2 years ago

Callisto Group TitleBest ResponseYou've already chosen the best response.0
Not really..\[\frac{A}{6}(2n+1)(n+1) = \frac{A}{6}(2n^2+3n+1) = ...?\]
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
oh and it is 2n² on the right
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
dw:1350057219369:dw
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
so that means to get 2n² A has to be 6
 2 years ago

Callisto Group TitleBest ResponseYou've already chosen the best response.0
I'm sorry but I have to go now... Basically, you need to expand the first term on the left, combine the like terms and compare the coefficient of x^2, x and constant terms on both sides. Then you can find A and B. As for your expansion, sorry again that it is wrong.
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
okay thank you! i shall work on this thank you for your help
 2 years ago

Callisto Group TitleBest ResponseYou've already chosen the best response.0
a has to be 6 is correct, I supposed :
 2 years ago

Callisto Group TitleBest ResponseYou've already chosen the best response.0
Once you find a, then compare the constant term on both sides. You should be able to get b. Good luck :)
 2 years ago

amorfide Group TitleBest ResponseYou've already chosen the best response.0
thank you :D
 2 years ago
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