Find the domain for f(g(x)) if g(x) = 2/ x-5 f(x) – 2x -3/ 5x + 10?
回答 (1)
2016-06-07 6:59 pm
g(x) = 2/ x-5
f(x) = - 2x -3/ 5x + 10
f(g(x)) = -2(2/x -5) -3/5(2/x-5) + 10
= -4/x + 10 - 6/5x + 3 + 10
= -4/x - 6/5x + 23
= (20-6x^2)/5x + 23
= (-6x^2 + 20)/5x + 23
f(x) = - 2x -3/ 5x + 10
f(g(x)) = -2(2/x -5) -3/5(2/x-5) + 10
= -4/x + 10 - 6/5x + 3 + 10
= -4/x - 6/5x + 23
= (20-6x^2)/5x + 23
= (-6x^2 + 20)/5x + 23
收錄日期: 2021-05-01 20:50:22
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160607093610AAmFla1