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April 21, 2014

April 21, 2014

Posted by **Anonymous** on Thursday, September 22, 2011 at 3:18pm.

- calculus -
**Steve**, Thursday, September 22, 2011 at 4:09pmThis is a typical problem using the chain rule: if y = f(u) and u = g(x), then dy/dx = dy/du * du/dx

Here, let u = 3x^2 - 5ax + a^2

So, y = u^4

dy/du = 4u^3

du/dx = 6x - 5a

dy/dx = 4u^3 * (6x-5a)

= 4(3x^2 - 5ax + a^2)^3 * (6x-5a)

Don't let the a's bother you. They're just some number, like 3 or -4, just one we don't happen to know. Just carry them through like any other constant.

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