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标题: [求助]GWD-21-3 [打印本页]

作者: 菲菲 时间: 2006-6-21 21:31 标题: [求助]GWD-21-3

Q3:

If f is the function defined by f(x) = 2x for x ≥ 0 and f(x) = x² for x < 0, what is the value of f(c) ?

(1) /c/ = 2

(2) c < 0

Ans is A, but I think there are 2 values, so it cannot be determined.

Can anyone explain?

作者: thinkers 时间: 2006-6-22 13:21

c = -2 => f(c) = (-2)^2 = 4

c = 2 => f(c) = 2*2 = 4

x has 2 values but f(c) only has 1 value.

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