Author Topic: Need help with some pre-calculus stuff  (Read 443 times)

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Offline shruikan

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Need help with some pre-calculus stuff
« on: November 19, 2013, 05:46:51 pm »
So we are working on derivatives right now... we're learning all those nifty rules to shortcut past the long formula...

derivative formula f'(x)=f(x+h)-f(x)
                                              h


so we've learned the power rule, the product rule, the chain rule, and the quotient rule to get past the trickier versions of this equation. the only problem is i cant figure out how to do the power rule... it goes as such
            if f(x)=axn  then the first step of the power rule does this   f'(x)=(na)xn-1
and i keep forgetting where to go from there
anyone wanna help?
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Offline Jethro

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Re: Need help with some pre-calculus stuff
« Reply #1 on: November 19, 2013, 07:23:21 pm »
That's actually all there is to the power rule. It's one of the easiest and most useful for derivatives.

Example: Find d/dx of 5x4+2x2+1

= 20x3+4x

Offline shruikan

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Re: Need help with some pre-calculus stuff
« Reply #2 on: November 19, 2013, 07:24:53 pm »
i cant figure out why i still keep getting them wrong... ive been doing that and my answer is way off...
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Offline Jethro

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Re: Need help with some pre-calculus stuff
« Reply #3 on: November 19, 2013, 07:26:37 pm »
It would be different if said problems applied the multiplication and quotient rule. But with just addition/subtraction you shouldn't be getting them wrong.

Offline shruikan

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Re: Need help with some pre-calculus stuff
« Reply #4 on: November 19, 2013, 07:35:50 pm »
ok... i just got behind the one day and couldnt catch up
any new friends are welcome.
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