math f.3急.

2009-11-12 2:13 am
solve the exponential equation

5^x+3 - 5^x+1 = 24 /5

吾該快d解答啦..thz,超急喔
更新1:

吾該晒...

回答 (1)

2009-11-12 2:17 am
✔ 最佳答案
5^x+3 - 5^x+1 = 24 /5
(5^x)(5^3)-(5^x)(5^1)=24/5
(125)(5^x)-5(5^x)=24/5
120(5^x)=24/5
5^x=24/600
5^x=12/300=6/150=1/25
5^x=5^(-2)
x=-2


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