Qualification > Math

C1 and C2 DOUBTS HERE!!!!!

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Darkstar3000:

--- Quote from: Engraved on May 30, 2010, 12:59:26 pm ---That is the factorized version of f(x).

--- End quote ---

thank you

Saladin:

--- Quote from: Darkstar3000 on May 30, 2010, 01:03:43 pm ---thank you

--- End quote ---

Here to help.

halosh92:
edexcel
hey
june 2005
Q10b
i got the gradient but i cant seem to do whats next , could someone do it ?
thx  :D

cooldude:

--- Quote from: halosh92 on May 30, 2010, 04:16:19 pm ---edexcel
hey
june 2005
Q10b
i got the gradient but i cant seem to do whats next , could someone do it ?
thx  :D

--- End quote ---

y'=2-(16/x^3)
the minimum point is-->
2-(16/x^3)=0
8=x^3
x=2
we can show it is minimum by finding the second derivate-->
y''=48/x^2
f''(2)=12
therefore since the second derivate is positive it is a minima
therefore x>2

halosh92:

--- Quote from: cooldude on May 30, 2010, 04:51:51 pm ---y'=2-(16/x^3)
the minimum point is-->
2-(16/x^3)=0
8=x^3
x=2
we can show it is minimum by finding the second derivate-->
y''=48/x^2
f''(2)=12
therefore since the second derivate is positive it is a minima
therefore x>2

--- End quote ---

thxxx :)

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