i need some maths help

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thread starter vectorwindia Mar 07 2010 + PM | QUOTE | PERMALINK | REPORT

can someone teach me how to factorise this =( (p+q)^2 - (p-q)^2 can you guys tell me all the steps.. thank you =D

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minnie 03/07/10 + PM | QUOTE | PERMALINK | REPORT

o_O no one knows =D

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ElfenLied 03/07/10 + PM | QUOTE | PERMALINK | REPORT

i hate math with a burning passion so i cannot help you

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Myterac + PM | QUOTE | PERMALINK | REPORT

It goes with A^2 + B^2 This always factors into (A+B)(A-B) You just have to memorize this So the answer is [(p+q)-(p-q)] and [(p+q)+(p+q)]

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Clerism 03/07/10 + PM | QUOTE | PERMALINK | REPORT

Isn't it already factorised?

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vectorwindia 03/07/10 + PM | QUOTE | PERMALINK | REPORT

is the maths book answer wrong coz it says 4pq is the answer o_O

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SilentXynh + PM | QUOTE | PERMALINK | REPORT

(p+q)^2 - (p-q)^2 [(p+q)+(p-q)] [(p+q)-(p-q)] [2p][2q] 4pq is the simplified result. EDIT: @TS: 4pq IS the result, heck, you wouldn't even need to factorise to see it.

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littOfiShx 03/07/10 + PM | QUOTE | PERMALINK | REPORT

Show your work for marks. [(p+q)(p+q)] - [(p-q)(p-q)] = (p^2+pq+pq+q^2) - (p^2-pq-pq+q^2) = p^2+pq+pq+q^2-p^2+pq+pq-q^2 = 4pq

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vectorwindia 03/07/10 + PM | QUOTE | PERMALINK | REPORT

wow thanks for the help guys =D

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SilentXynh 03/07/10 + PM | QUOTE | PERMALINK | REPORT

[quote] littOfiShx : Show your work for marks. [(p+q)(p+q)] - [(p-q)(p-q)] = (p^2+pq+pq+q^2) - (p^2-pq-pq+q^2) = p^2+pq+pq+q^2-p^2+pq+pq-q^2 = 4pq [/quote] I know that it's already been answered, but why would you go about it the long way? :P Use the fact that it's a difference of two squares and factorise, then simplify.

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littOfiShx 03/07/10 + PM | QUOTE | PERMALINK | REPORT

[quote] SilentXynh : I know that it's already been answered, but why would you go about it the long way? :P Use the fact that it's a difference of two squares and factorise, then simplify. [/quote] He specifically asked to show all steps. I'd assume his teacher would like to see all the mathematical steps, not just simply stating "It's a difference of two squares."

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SilentXynh 03/07/10 + PM | QUOTE | PERMALINK | REPORT

[quote] littOfiShx : He specifically asked to show all steps. I'd assume his teacher would like to see all the mathematical steps, not just simply stating "It's a difference of two squares." [/quote] Not arguing with the show all steps part, I've even added an extra part to my solution for it. I'm saying that you took the long way of expanding the terms out when you could factorise it by stating that it's a difference of two squares. I'm not saying your method is wrong either, it's just slightly more tedious

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