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# What is the largest possible value of x if (x^2 + 16)(x +

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Manager
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What is the largest possible value of x if (x^2 + 16)(x + [#permalink]

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09 Mar 2007, 11:03
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What is the largest possible value of x if (x^2 + 16)(x + 3)(x + 5) = 0?

a) â€“4
b) â€“3
c) â€“2
d) 3
e) 5
Director
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11 Mar 2007, 22:15
rdg wrote:
Shouldn't we consider x^2+16=0 as well?

x^2+16=0
x^2=-16
square of any number x will never be negative
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11 Mar 2007, 22:31
though square of the number can be negative as well, which are defined by iota(imaginary number)... but as far as GMAT is concerned only real numbers are considered so square of the number cannot be taken as negative.

regards,

Amardeep
11 Mar 2007, 22:31
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# What is the largest possible value of x if (x^2 + 16)(x +

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