Qualification > Math

[CIE] All Pure Mathematics (P1, P2 and P3) doubts here !

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Arthur Bon Zavi:

--- Quote from: Ari Ben Canaan on May 05, 2011, 10:44:47 am ---MS Word 2007. There's a math Plug-in you get. You used to get it for free (which is how I got it), but now you have to pay.

--- End quote ---

Okay.

$H00t!N& $t@r:
thanks ari for the detailed answer. +rep  :)

physichemaths:

--- Quote from: Ari Ben Canaan on May 05, 2011, 07:22:33 am ---Determine the range of the f(x) for the individual functions.

This will be the domains for the inverse of each individual function.

--- End quote ---

part iii?

I Jimmy I:
Hello, ok I have a doubt in the 2nd question....

I know we have to use the "b2-4ac" method to arive with k2+4k-12=0

And I already got the answer as k=2 and k=-6
But in the Marking Scheme it says k>2 and k<-6
So how do I know which sign to use for which number.... I mean in the exam how should I know its k>2 not k>-6 and vice versa. Could some1 explain..?

Thank You

I Jimmy I:
Ok so I found a solution which is to take values above and below 2 as well as above and below -6 then check if its greater than 0 or not.

So I should take the range of values which give an answer of >= 0? If this is correct plz confirm :)

TYVM

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