Here’s the slides from the lesson. Ex 6F please for Weds!
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Mr Brewin’s Y12 – C1 – Sequences11 comments to Mr Brewin’s Y12 – C1 – Sequences |
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Hi,
With Calculus/Differentiation,
e.g. f(x) = x3 – 9×2 + 24x + 20
i know that u can differentiate that to
>> f’(x) = 3×2-18x+24
but can one keep differentiating it down to
>> f’(x) = 6x-18 ???? or can u only differentiate once?
Hi Deola,
No, you can differentate more than once. The first derivative gives you the gradient ie how the function is changing with x. The second derivative tells you how the gradient is changing with x, and thus it is used to work out whether a turning point is a max or min.
Mrs T
in one of the past papers part of a question is: show that k satisfies (3k-100)(k+35), which i’ve done, but i can’t seem to get the next bit- find the value of k.
The answer says its 100/3 so k=33 but i dont know where these numbers have come from…. help please
Hi Mariam,
There must be some info somewhere in the question which will enable you to turn this expression into an equation. You can’t solve for k without an equation.
If you can’t find it, you’ll need to give me the paper details or type out the question.
Have fun,
Mrs T
Ive got the equation 3k^2+5k-3500<0
its from the paper- 10 January 2007- afternoon
reference :6663/01
I hope thats helpful, and thanks for helping
OK… So it looks like that’ll go to:
$latex (x – 33\frac{1}{3})(x +35) \latex$
Thanks to http://www.math.com/students/calculators/source/quadratic.htm
Ooops… Latex not working in comments.
(k – 33 1/3) ( k + 35)
oh rite, i think i get it now, thanks sir
for the january stats exam, we only have to revise up to 5.3 rite, the addition rule???
how do you prove that Sn=1/2n (2a+(n-1)d) using gauss’ method????
It’s right there in the text book. You start with a + (a + d) + (a + 2d)… up to (a + (n-1)d) then you reverse it, and subtract… Enough to go on?