True or false,The function f(x)=a^x+4 will never cross the x-axis.

[From: ] [author: ] [Date: 12-04-12] [Hit: ]

False.

Quick counter-example: a = -5
f(1) = (-5)^1 + 4 = -1

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It depends on the value of a
It is true if a ≥ 0
It is false if a < 0

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