F4 Math一問~~~~~

👨🏻‍🏫 學術台數學

用戶205747

2007-09-30 10:44 pm

If g ( x-1 )=3^x-4 , find g(1 ) .

回答 (3)

[匿名]

2007-09-30 10:52 pm

✔ 最佳答案

Method 1

g ( x-1 )=3^x-4 = 3^(x-1+1)-4 = [3^(x-1)]*3-4

put x-1=1,

g(1) = 5

Method 2

put x-1=1,
x=2

when x=2, g(1) = 3^2-4 = 5

參考: 我

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hung yu

2007-10-01 5:51 pm

Put x=2,

g(1)=3^2-4=5

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用戶16828

2007-09-30 10:55 pm

g( x - 1 ) = 3x-4
g( x - 1 ) = 3(x-1)-3
g (y) = 3y-3
When y = 1,
g(1) = 31-3
g(1) = 3-2
g(1) = 1/9

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