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 10-11-2012, 09:03 PM #1 Junior Member   Join Date: Apr 2011 Posts: 98 PSAT Math Grid-In Answers Can Equal Zero? I used to think a Grid-In Answer could never be zero; this question changed my mind. If (a-10b)^2=a^2+ 100b^2, what is a^2b^4 That just made the PSAT a whole lot harder. Or is it just common sense that if: a -b + c = a + c one would assume that a^2b^4 would be zero? Reply
 10-11-2012, 09:41 PM #2 Member   Join Date: Sep 2012 Posts: 735 (a - 10b)^2 foils to a^2 - 20ab + 100b^2 not a^2 + 100b^2. So a or b must be equal to 0. If we assume that a = 0 then 0^(2b^4). 0 to any non-zero power is 0. If we assume b = 0, a^((2*0)^4) = a^(0^4) = a^0 and any non-zero number raised to the 0 power is one. so when b = 0, a^(2b^4) = 1. So the answer is either 1 or 0. But there's not enough information to know which answer they want. Reply
 10-12-2012, 12:24 AM #3 Member   Join Date: Jul 2011 Location: Pigfarts, Wonderland Posts: 868 Yes PSAT Grid-in allows zeros. Reply
 10-12-2012, 10:17 PM #4 Senior Member   Join Date: Mar 2008 Location: NJ Posts: 1,313 A grid-in answer of zero occurred on the May 2011 SAT. But these are very unusual. Reply

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