Stormgal Posted May 16, 2005 Share Posted May 16, 2005 If r does not equal to zero, and r* is defined as 1/r-1, what is the value of: -(r*) + (r-1)* A. 1/r^2 - r B. r^2 + r -1/r^2 - r C. 2r^2 + 2r +1/r-r^2 D. 2 - 3r/r E. 2r - 1/r^2 - r :eek: Quote Link to comment Share on other sites More sharing options...
arjmen Posted May 16, 2005 Share Posted May 16, 2005 If r does not equal to zero, and r* is defined as 1/r-1, what is the value of: -(r*) + (r-1)* Do you mean r* = (1/r)-1? If so, then -(r*) + (r-1)* = - [(1/r)-1] + [(1/(r-1))-1] = - (1/r) + 1 + (1/(r-1)) - 1 = [-(r-1)+r]/(r*(r-1)) = [-r+1+r]/(r^2 - r) = 1/(r^2-r) Quote Link to comment Share on other sites More sharing options...
rd_eastbay Posted May 16, 2005 Share Posted May 16, 2005 A assuming it is 1/(r^2-r) and r* is (1/r)-1. Quote Link to comment Share on other sites More sharing options...
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