Find the derivative of the function f(x)=-3(2-9x)^(1/4)  TOPIC_SOLVED

Limits, differentiation, related rates, integration, trig integrals, etc.

Find the derivative of the function f(x)=-3(2-9x)^(1/4)

Postby Cafe au lait on Mon Jan 03, 2011 11:22 pm

Find the derivative of the function f(x)=-3(2-9x)^(1/4)

I have:

f'(x)=-3[1/4(2-9x)(-9)]+0(2-9x)^(1/4)
=-3[-9/4(2-9x)]
=-3(81/4x-9/2)
=-243/4x+27/2

Did I do that right?
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Re: Find the derivative of the function f(x)=-3(2-9x)^(1/4)

Postby nona.m.nona on Mon Jan 03, 2011 11:58 pm

Cafe au lait wrote:Find the derivative of the function f(x)=-3(2-9x)^(1/4)

I have:

f'(x)=-3[1/4(2-9x)(-9)]+0(2-9x)^(1/4)

When you took the 1/4 power down front, what should have been left behind as the power on the parenthetical?
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Re: Find the derivative of the function f(x)=-3(2-9x)^(1/4)  TOPIC_SOLVED

Postby Cafe au lait on Tue Jan 04, 2011 2:16 am

Lol I redid it without the product rule and that made it a lot easier! I know I got it right now, thanks! :)
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