If 5^(-kx) = 8
find the value of k
I need steps.
Thank you.
更新1:
When 3^(x-3) = 5^(x-3) x=? Steps please.
F4 Maths Question
2010-01-18 12:13 am
It is given that 5^x = 0.5
If 5^(-kx) = 8
find the value of k
I need steps.
Thank you.
If 5^(-kx) = 8
find the value of k
I need steps.
Thank you.
回答 (1)
2010-01-18 12:24 am
✔ 最佳答案
5^(-kx) = 8(5^x)^(-k) = 8
0.5^(-k) = 8
(2^-1)^(-k) = 8
2 ^ k = 8
2 ^ k = 2 ^ 3
k = 3
2010-01-17 16:32:52 補充：
Since 3^0 = 5^0
When 3^(x-3) = 5^(x-3)
x-3 = 0
x = 3
收錄日期: 2021-04-21 22:06:15
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