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03 Mar 2008, 08:18
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given that y>0 and y(y+1) > y(y-4), solve for the possible values of y.
y(y+1) > y(y-4) if i were to cancel out y from both sides, it would result in a different answer. what rule am i volating?
y(y+1) - y(y-4)> 0
ans: y>0
y(y+1) > y(y-4) if i were to cancel out y from both sides, it would result in a different answer. what rule am i volating?
y(y+1) - y(y-4)> 0
ans: y>0
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03 Mar 2008, 08:56
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in this example, you can do it, otherwise it is not adviceable.
Because sometimes cancelling out term from each side could result in less factors espesially when your are working with Data sufficiency problem.
Capthan
Because sometimes cancelling out term from each side could result in less factors espesially when your are working with Data sufficiency problem.
Capthan
03 Mar 2008, 12:15
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Yurik79
i still dont understand.
if i cancel out y, i have
y+1 > y-4
in order to solve for y, i need to move the y to one side but doing so eliminates the y.
y+1 > y-4
+1 > -4
5 > 0
does this mean that since we know 5>0 is true, the only thing we can infer from y is the given portion in the stem? y>0
