Recent content by Smilebuffalo

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    Polynomials

    how come when you rooted it, you ignored the negative root?
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    Polynomials

    If ax^3 + cx + d = 0 has a double root, show that 27ad^2 + 4c^3 = 0
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    Integration by Substitution

    integrate sqrt(x)/(x*sqrt(x) +2) u = x*sqrt(x)
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    Exchange Rates - RBA intervention ???

    Hey guys, Can someone give me a good explanation on how the RBA affects the exchange rate by dirtying the float? Also, how does sterilisation work?
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    Biochemistry!

    A few questions about this option module 1) Is this option any good? My teacher wants to do this option because he specialises in it (although he's not a very good teacher anyway so i don't see the point in picking such an obscure option module). 2) How hard is this topic relative to the...
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    A few general Biochemistry Questions

    A few questions about this option module 1) Is this option any good? My teacher wants to do this option because he specialises in it (although he's not a very good teacher anyway so i don't see the point in picking such an obscure option module). 2) How hard is this topic relative to the other...
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    Question about MX1 marks

    Hey guys. I'm not sure if this is the right place to post this, but anyway. In 2009 i was accelerated and did 2unit and extension 1 maths for the HSC. For extension 1 maths, my mark was 47/50. However this year I'm also doing extension two maths, so my mark for extension one maths will become...
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    Increasing curve question

    yea i know but for what value(s) of x?
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    Increasing curve question

    P(x) = 8x^3 -12x^2 + 6x + 13. For what values of x is P(x) increasing?
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    Question about Auxillary Method - Trig

    When looking at past HSC solutions the answer always derives how to transform asinx + bcosx into Rsin(x + $) I was wondering if we have to derive it as well, or can we simply use the formula for finding R and $ using: R = sqrt(a^2 + b^2) and tan $ = b/a ???
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    Shm hsc p

    A particle, whose displacement is x, moves in simple harmonic motion. Find x as a function of t if: acceleration = −4x and if x = 3 and v = −6root3 when t = 0.
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    How many 3unit papers have you done?

    So when you've completed all of the available actual past HSC exams, what other papers do you do? What school's past papers are good to practice on and where can i access them?
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    1998 hsc shm

    oooh i see now. I was reading the exam report and marking a past exam late at night so i must've missed the minus sign. Thank you very much for pointing that out :uhhuh:
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    1998 hsc shm

    3.c) A particle moves in a straight line and its position at time t is given by: x=1+sin4t+ (root3)cos4t (i) Prove that the particle is undergoing simple harmonic motion about x = 1. When i was reading the exam report, they said it was incorrect to do the following: a = −16 sin 4t −...
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