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For all integers n, the function f is defined by f(n)=a^n

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For all integers n, the function f is defined by f(n)=a^n [#permalink] New post 11 Jul 2009, 09:26
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For all integers n, the function f is defined by f(n) = a^n, where a is a constant. What is the value of f(1) ?

(1) f(2) = 100
(2) f(3) = –1,000

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Re: Functions - help [#permalink] New post 11 Jul 2009, 10:12
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square root of any number can be either positive or negative, but cube root of any number will always have the same sign as the number itself.

stmt 1 only gives us the absolute value of a, but not the sign
Stmt 2 alone gives us both, the value and sign, ie a = -10

So B
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Re: Functions - help [#permalink] New post 11 Jul 2009, 12:46
nice and simple explanation right off the bat. thanks
Re: Functions - help   [#permalink] 11 Jul 2009, 12:46
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For all integers n, the function f is defined by f(n)=a^n

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