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Math Help - Need help with some basics.

  1. #1
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    Need help with some basics.

    1.) find all real number solutions, by 2 decimal places. 9b^4 = 6

    2.) Find the approx equation y = ab^2 of the exponential curve that contains the given pair of points. ( 0, 82 ) , (6, 19)

    This is not for homework, just reviewing algebra basics.
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  2. #2
    MHF Contributor ebaines's Avatar
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    Re: Need help with some basics.

    Quote Originally Posted by wolfwood View Post
    1.) find all real number solutions, by 2 decimal places. 9b^4 = 6
    Divide through by 9 and simplify to get b^4 = 2/3. Then take the fourth root of both sides:  (b^4)^{1/4} = b = (2/3)^{1/4}. Do you have a calculator? Remember that there are both positive and negative values for b.

    Quote Originally Posted by wolfwood View Post
    2.) Find the approx equation y = ab^2 of the exponential curve that contains the given pair of points. ( 0, 82 ) , (6, 19)
    I don't understand - perhaps you meant to write y = ax^2? If so, that equation would go through (0,0), not (0,82). Perhaps you meant an equation of the form y = ax^2 + b?
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