If f(3x)=9x^2 + 6x -3
Find a ) f(1)
b ) f(a)
F4 Math一問~~~~~
2007-10-05 3:33 am
回答 (1)
2007-10-05 3:37 am
✔ 最佳答案
f(3x) = 9x2 + 6x – 3 f(x) = 9(x/3)2 + 6(x/3) – 3
= x2 + 2x – 3
a. f(1) = (1)2 + 2(1) – 3
f(1) = 0
b. f(a) = a2 + 2a – 3
f(a) = (a - 1)(a + 3)
參考: Myself~~~
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