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Re: inequalities and modulus [#permalink]
06 Jun 2006, 04:30

shobhitb wrote:

Professor wrote:

gmatmba wrote:

Professor wrote:

yasmeen wrote:

find the number of integers satisfying the inequality (x^2 + x - 6) (x^2 - x - 20) < 0 a. 4 b.2 c.0 d. infinitely many

A. 4 (the numbers are 1, 2, 3 and 4). if we donot consider -ves.

prof, x=1 does not make the expression < 0 or am i missing something, can you please re-evaluate?

nope. i was missing. it is B.

the only satisfying integers are 3 and 4 not 1, 2, 0, -1, -2, -3, -4, -5 and so on.

Have detailed the way I solved the problem. Might be useful.

Good work shobhit. Interval method is the best for solving both Modulus and polynomial inequality questions.
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gmatclubot

Re: inequalities and modulus
[#permalink]
06 Jun 2006, 04:30