(a) Find (f ○ g)(x).
(b) Find (g ○ f)(x).
(c) Find f(g(−2)).
(d) Find g(f(4)).
Consider the following functions. f(x) = x3 + 2x2, g(x) = 4x?
2016-10-25 10:25 pm
回答 (2)
2016-10-25 10:35 pm
(f∘g)(x) = f(g(x))
= f(4x)
= (4x)³ + 2(4x)²
= 64x³ + 32x²
= f(4x)
= (4x)³ + 2(4x)²
= 64x³ + 32x²
2016-10-25 10:34 pm
just follow 'directions '...[ f o g ][(x) = f ( g(x)) = g³ + 2 g² ≡ ( 4x)³ + 2 ( 4x)² ===> f(g(-2) = ( - 8 )³ + 3 ( -8)²
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20161025142551AAQQKy9