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2002 Winter diet paper 1 Q10 - HSN forum

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2002 Winter diet paper 1 Q10


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#1 Azie

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Posted 14 May 2007 - 08:17 PM

"A function f is defined by f(x) = 2x+3+18/x-4, x cannot equal to 4. Find the values of x for which the function is increasing.

So far i've got:
f(x) = 2x+3+18(x-4)^-1
f'(x) = 2 -18(x-4)^-2

The function is said to be increasing when f'(x) > 0
2-18(x-4)^-2 > 0

now wat? :S





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