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標題: S6 Maths & Stat Logarithmic Functions [打印本頁]

作者: kankanqa 時間: 10-10-26 11:45 PM 標題: S6 Maths & Stat Logarithmic Functions

1.  log2 (x-15) = 3+ log2 (x-1)

2. If log3  (2x+a) = 2, find x in terms of a.

3. Transform the following model to linear form:

      y=(a^m)(b^x)
   Given that x is the horizontal axis, explain what graph you will plot and what the slope and y-intercept are.

作者: 壺一v一 時間: 10-10-28 06:30 PM

唔係好睇得明你打咩
可能應該
log轉ln 之後take多個e比佢

作者: Naozumi 時間: 10-10-28 08:30 PM

log2 (x-15) = 3+ log2 (x-1)
log2 (x - 15) - log2 (x-1) = 3
   log2 [(x - 15)/(x - 1)] = 3
               (x - 15)/(x - 1) = 8
剩番果d手尾應該冇問題啦

log3  (2x+a) = 2
         2x + a = 9
剩番果d手尾應該冇問題啦

   y=(a^m)(b^x)
log y = log [(a^m)(b^x)]
log y = log a^m + log b^x
log y = m log a + x (log b)

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