2. 外语
  3. If the function f(x)= x + 2, and the function g(x)= 3x, what is the function g(f(x))?

If the function f(x)= x + 2, and the function g(x)= 3x, what is the function g(f(x))?

admin2013-02-19  8
问题 If the function f(x)= x + 2, and the function g(x)= 3x, what is the function g(f(x))?
选项
答案3x + 6
解析 The problem gives g(x)= 3x and f(x)= x + 2 and asks for g(f(x)). The function g(f(x))means that all of the x values in g(x)are replaced with f(x), as follows:
g(f(x))= 3(f(x))
g(f(x))= 3(x + 2)
g(f(x))= 3x + 6
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