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 Sasha #1 Posted : Thursday, August 02, 2012 9:23:28 PM Rank: NewbieGroups: Registered Joined: 5/9/2012Posts: 1Thanks: 0 timesWas thanked: 0 time(s) in 0 post(s) In regards to physics and chemistry equations, I'm assuming there should never be a need to use the quadratic formula. Given this, what are we supposed to do to solve for for a variable in situations like the on pg. 200 of the Chemistry class companion? Where:(x= 9.5 x 10^-8 is derived from (x + 10^-8)(x)Or to find time (t) from the equation: Y = Yo + Voyt - 1/2gt^2 Back to top User Profile
 simonfeng #2 Posted : Monday, July 01, 2013 1:09:30 PM Rank: InstructorGroups: Registered Joined: 5/27/2012Posts: 5Thanks: 0 timesWas thanked: 0 time(s) in 0 post(s) Hi Sasha,How I recommended that my students solve those problems is to use estimation. For that particular chemistry equation, I told them to treat the [H+] as 10^-8 + 10^-7. That gives 1.1^-7 which is close enough to the actual value to help you guess the correct answer once you solve for it.For the kinematics equation, there will usually be a way to either eliminate one or two of the components on the right of that equation. As far as I know, I have never seen the need to know how to manipulate the quadratic formula on the MCAT. Back to top User Profile
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