Results 1 to 4 of 4

Math Help - Problem to derive

  1. #1
    Newbie
    Joined
    Jul 2009
    Posts
    15

    Problem to derive

    Hello there, I am very sorry if this is the wrong forum, but since I am from sweden our way of naming math courses are very different from the american way. Im reading a course named simply: Math

    anyhow my problem is that I have to derive the following

    f(x)=(1+4x)^{1861}(1-7x)^{983}

    if f(0)

    Im not sure what to do, do i calculate whats inside the () first or do I derive first? and if i derive first, then how do I do it?

    Thanks and sorry once again if this is the wrong forum
    Janne the Swede
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Grand Panjandrum
    Joined
    Nov 2005
    From
    someplace
    Posts
    14,972
    Thanks
    4
    Quote Originally Posted by JannetheSwede View Post
    Hello there, I am very sorry if this is the wrong forum, but since I am from sweden our way of naming math courses are very different from the american way. Im reading a course named simply: Math

    anyhow my problem is that I have to derive the following

    f(x)=(1+4x)^{1861}(1-7x)^{983}

    if f(0)

    Im not sure what to do, do i calculate whats inside the () first or do I derive first? and if i derive first, then how do I do it?

    Thanks and sorry once again if this is the wrong forum
    Janne the Swede
    If you evaluate at x=0 first you just have a number and its derivative is zero as it is no longer a function of x. You differentiate first then substitute x=0.

    CB
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor

    Joined
    Apr 2005
    Posts
    15,569
    Thanks
    1410
    Quote Originally Posted by JannetheSwede View Post
    Hello there, I am very sorry if this is the wrong forum, but since I am from sweden our way of naming math courses are very different from the american way. Im reading a course named simply: Math

    anyhow my problem is that I have to derive the following

    f(x)=(1+4x)^{1861}(1-7x)^{983}

    if f(0)
    "if f(0)" what? Do you mean at x= 0?

    Im not sure what to do, do i calculate whats inside the () first or do I derive first? and if i derive first, then how do I do it?
    That's a product of two functions so you would use the product rule. And then the chain rule on each factor.

    Thanks and sorry once again if this is the wrong forum
    Janne the Swede
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Jul 2009
    Posts
    15
    Quote Originally Posted by HallsofIvy View Post
    "if f(0)" what? Do you mean at x= 0?

    Yea, thats it ^^

    Normally at least in our school books they give us the equation

    for example f(x)=2x

    and then ask us to calculate what the equation is equal to
    "if f(2)"
    and that is indeed x=2 but explained in a very silly way
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. y = e4x - 3 derive
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: March 31st 2011, 04:34 AM
  2. Replies: 2
    Last Post: March 27th 2011, 08:19 AM
  3. Did I derive this right?
    Posted in the Calculus Forum
    Replies: 12
    Last Post: May 1st 2010, 10:10 AM
  4. Derive tan (x/2)
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: April 25th 2010, 12:51 AM
  5. derive
    Posted in the Calculus Forum
    Replies: 1
    Last Post: March 29th 2009, 09:42 PM

Search Tags


/mathhelpforum @mathhelpforum