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Leaving Cert 2012-13 *OFF-TOPIC* (hideaway) thread
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Anyone else get creeped out when people say theyre just going to do questions or a full paper as their study? Like I cant do that because I still have to learn the information let alone recall it and perfect answering styles
And I have actually been studying, I dont know where it all went so wrong. My life has been consumed by the LC and all I can do all day is whinge about it 0 -
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Could someone who's good at maths tell me where the -2 power came out of in (ii) of this question in the second line?
http://www.e-xamit.ie/tutorial.php?id=45121&prep=45120&soln=45121&tip=45122&port=45210
When you differentiate by any rule (chain, product, quotient) you're decreasing the power, so with the original function (x squared -5x) to the power of -1, that -1 is the power, so that'll decrease by 1. -1-1=-2, so there's your new power.
In this particular function you're differentiating by the chain rule because it's a bracket to a power. This involves decreasing the power of the bracket (where the -2 comes in), multiplying the bracket by the original power, differentiating what's inside the bracket and multiplying the whole shebang as shown in the second line.
Yeah, if anyone can explain that a bit less long-winded please do, but I hope that helps
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Parawhore.xD wrote: »It comes from the basic rule when you differentiate that x^n becomes x^n-1
i.e: -1-1=-2
Does that answer your question or have I misunderstood you?Monsieur Folie wrote: »It's a chain rule differentiation. What they've done is taken the bracket, multiplied it by the original power (the -1) and then dropped the power itself by one (that's where your -2 comes from). That's the same as x squared becoming 2x when you differentiate it, the power of the x has been dropped by one! Then that's all multiplied by the derivative of the bracket itself (the 2x-5) to account for the chain rule. Does that make sense to you?Acciaccatura wrote: »When you differentiate by any rule (chain, product, quotient) you're decreasing the power, so with the original function (x squared -5x) to the power of -1, that -1 is the power, so that'll decrease by 1. -1-1=-2, so there's your new power.
In this particular function you're differentiating by the chain rule because it's a bracket to a power. This involves decreasing the power of the bracket (where the -2 comes in), multiplying the bracket by the original power, differentiating what's inside the bracket and multiplying the whole shebang as shown in the second line.
Yeah, if anyone can explain that a bit less long-winded please do, but I hope that helps
Makes sense now thanks!0 -
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Anyone happen to have the answers to the financial maths question on the HL DEB mock? Would appreciate it if you did! Trying to check my answers
a) .2871%
b) 1st =1512.96 2nd=1508.63 3rd=1504.31
c)just your geometric sequence with a = 1500(1.002871), r = 1.002871, n =300
d)714332.95
e)357168.85 0 -
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Bonbon1995 wrote: »2.5 - 3 pages..know the poets too..12 makes goes for just known like half a page on them.. know themes and imagery and that's it really!
Alright thanks I am sorted for the poets and that just wanted to get an idea of how much people will be writing. 0 -
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Bonbon1995 wrote: »Poetry is piss easy thank God Hoping for oisin do you do maidhc danín or an triail?
Yeah it's fairly grand. Yep we do A Thig Na Tit Orm :P0 -
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