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The function f(x) = ax^r satisfies f(2) = 1 and f(128) = 5. Find r.

 Oct 17, 2020
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a(2)r = 1       2r = 1/a 

a(128)r = 5     a(27)r = 5

                       a (1/a)7 =5

                          1/a6 = 5

                           1/5 = a6

                                  a = .76472449              .764724491 * (2r) = 1      r = .38699

 
 Oct 17, 2020

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