You have not said what the derivitive is with respect to. Are we differentiating with respect to time (t) or distance (x)? If you want help you need to specify the problem precisely.
anonymous
2009-08-05 11:31:33 UTC
Let's do this properly, with implicit differentiation.
(p+1)q^2 = 1000
pq^2 + q^2 = 1000
Differentiate both sides...
q^2 + 2pq(dp/dq)+2q(dp/dq) = 0
2p(dp/dq)+2(dp/dq) = -q
2(dp/dq)(p+1) = -q
(dp/dq) = -q/(2p+2)
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