#Please help, I have been struggling on this for a bit

13 messages · Page 1 of 1 (latest)

daring horizonBOT
river frigate
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I think you should expand and then use the limit definition of the derivative (first principles)

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no, but it doesn't use first principles (which is what the question is asking for, if I'm not mistaken)

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If you want a reference on how to differentiate a function using first principles, I've found a online image showing the process for the function x^2

maxresdefault.png
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you can simply replace x^2 with your 18t - 9t^2

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just remember to replace ALL t's with (t+h) when doing the substution

daring horizonBOT
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Solved

Post marked as solved by @narrow patrol.

Use .unsolved if this was a mistake.

river frigate
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that's right

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your final answer after doing first principles should be identical to the one you got in this image

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so if it isn't

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then you likely made an arithmetic mistake or something

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just an fyi

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you're welcome!