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Given the following statements: \( 2x + 3y =12 \)
\( xy = 6\)
What is \(8x^3 + 27y^3\)?
 one year ago
 one year ago
Given the following statements: \( 2x + 3y =12 \) \( xy = 6\) What is \(8x^3 + 27y^3\)?
 one year ago
 one year ago

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lgbasalloteBest ResponseYou've already chosen the best response.1
\[(8x^3 + 27y^3) \implies (2x +3y)(4x^2 + 6(xy) + 9y^2\] does that give you a hint
 one year ago

waterineyesBest ResponseYou've already chosen the best response.2
\[a^3 + b^3 = (a + b)(a^2 + b^2  ab)\]
 one year ago

apoorvkBest ResponseYou've already chosen the best response.0
\[8x^3 + 27y^3 = (2x)^3 + (3y)^3\] Use the funda below: \[(a)^3+(b)^3 = (a+b)(a^2ab +b^2)\]
 one year ago

lgbasalloteBest ResponseYou've already chosen the best response.1
\[\implies (2x+3y)[(2x + 3y)^2  6(xy)]\] \[\implies (12)[(12)^2  6(6)]\] \[\implies (12)[144  36]\] etc.
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
@ParthKohli may i give you an advise?
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
dude this is in class IX maths 2nd chapter try to do problems also from entrancei.com or from ncert exempler problems usually this advice is not given by any teacher ( some are exceptional ) but i am giving you since talent needs guidance :)
 one year ago

ParthKohliBest ResponseYou've already chosen the best response.0
Let me try to watch some videos related to this topic so I could brushup my skills. Thanks!
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
Yes that is a better way @ParthKohli but videos are ok for you as you are in a lower age for this level that is you are doing higher but remember : when you come in 9th dont prefer videos since videos make the student dependent .. :) best of luck dude .. and thanks for taking that as positive
 one year ago

ParthKohliBest ResponseYou've already chosen the best response.0
I disagree: Videos are pretty dynamic and visual.
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
friend ... they are dynamic and visual , they can be used for at the last days of exams .. to just revise withing minutes but my main point was that "dont' dedicate yourself completely on videos .. but since you are at present doing higher .. prefer videos first :) "
 one year ago

ParthKohliBest ResponseYou've already chosen the best response.0
I see. I do know polynomials, but I don't know how to do these kinds of problems. Let me see.
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
being disagreed has the reason since at this time videos are helping you very much ... for higher level .. .
 one year ago

ParthKohliBest ResponseYou've already chosen the best response.0
I use http://tutorial.math.lamar.edu, but it doesn't have such practice problems.
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
for practice problems prefer this link : http://www.ncert.nic.in/NCERTS/textbook/textbook.htm?ieep2=217
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
main concepts .. then problems
 one year ago

ParthKohliBest ResponseYou've already chosen the best response.0
I actually do know all these identities, but sometimes it becomes a paininthebrain to apply them.
 one year ago

mathsloverBest ResponseYou've already chosen the best response.0
Hmn yes it becomes .. see whenever you are given with that type of questions and you know that is something related to this topic then : try to make it similar to the identities
 one year ago
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