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by vladmire » Sun Dec 07, 2008 8:17 am
Should I plug a number into the variable x? solve and then divide by 2 and do the same for each answer choice?
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by cramya » Sun Dec 07, 2008 9:05 am
(x+2)^2 = x^2+4+4x

(x-2)^2 = x^2+4-4x

Average = (x+2)^2 + (x-2)^2 / 2

= x^2+4+4x + x^2+4-4x / 2

= 2x^2+8/2
= 2(x^2+4) / 2

= x^2+4
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by kris610 » Sun Dec 07, 2008 2:37 pm
Vlad, while posting questions from the GMATPrep, can you please mention that in the subject of the post!
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by vishubn » Sun Dec 07, 2008 6:28 pm
Should I plug a number into the variable x? solve and then divide by 2 and do the same for each answer choice?
plugging will take more time than solving algebraically ! at least for this problem it holds good

the formula u required to know is simple so rather sole it than plugging in

Vishu
KILL !! DIE !! or BEAT my FEAR !!! de@D END!!
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