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Re: Factoring...? (m02 #8) [#permalink]
28 Feb 2008, 19:59
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The question is:
x any y are both positive integers, and: x > y x^2 - 1 > y^4 - 4y + x - 1
Which of the following represents all the possible values of y?
ANSWER: Let us first simplify the inequality. Cancel out the (-1) from both sides and move the over to the left hand side: Then factor out the from the left hand side and the on the right hand side: When we divided both parts of the equation by , we assumed that it is greater than 0. Since at the end we are left without a variable, this means that the equation works for any value where