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Math Help - Checkers

  1. #1
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    Checkers

    I was wondering if someone can check my work on these 2 problems about integrals.

    A) the integrals from -2 to 3 (25)^2x+1 dx
    the answer i got was [25^(7) / 2ln(25)] / [25^(-1) /2ln(25)]

    B) the ingtegral 7x 6^(1-2x^2) dx
    the answer i got was (-7/4) [6^1-x^2] / [4ln(6)] + C

    thanks for the help
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by uniquereason81 View Post
    I was wondering if someone can check my work on these 2 problems about integrals.

    A) the integrals from -2 to 3 (25)^2x+1 dx
    the answer i got was [25^(7) / 2ln(25)] / [25^(-1) /2ln(25)]
    Use more brackets to make the integrand unabiguous.

    Why have you not simplified this? It looks like it simplifies to 25^8 to me.

    Your integrand is bounded above by 25^7 and is over an interval of length 5 so an upper bound on the integral is 5x25^7<25^8.

    This integral look to be ~=25^6.4 to me.

    CB
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