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Homework Help: Calculating indefinite integrals

  1. Mar 30, 2012 #1
    1. The problem statement, all variables and given/known data
    a) S 13(4^x + 3^x)dx
    b) S (cosx + sec^2x)dx
    c) S (3-(1/x))dx
    d) S e^(7x)dx


    2. Relevant equations

    The S is supposed to be the integration sign

    3. The attempt at a solution

    Are these correct or at least close?

    a) = 13((4^x)/(ln(4) + (3^x)/(ln(3))) + C

    b) = (sinx + tanx) + C

    c) = -ln + C

    d) Do I use U-substitution for this one?
     
  2. jcsd
  3. Mar 30, 2012 #2

    HallsofIvy

    User Avatar
    Science Advisor

    c) and d) are incorrect. The integral of "3" is "3x". For d), yes, use substitution. Let u= 7x.
     
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