
#1
Aug2605, 09:17 AM

P: 7

Hi,
I desperately need help with this qns: In an Argan Diagram, the points A, B, C, D represent the copmlex numbers a,b,c,d respectively. Guiven that ABCD is a rectangle describd in an anticlocwise sense, with AB=2CB, and a=2i, c=3+5i, find b and d (AB and CD are not parallel to the xaxis) I've tried using dot product and gradient method, by letting B be (x,y), it all comes down to the equation y^24y5+x^26x=0  (1) AC = sqrt 61, and since ABC makes a right angled triangle, CB=1 unit, AB=2 units, therefore AB=sqrt 61 divided by sqrt5 multipled by 2 (pythagoras theorm) Then i equate that sqrt61/sqrt5 x 2 to the magnitude of AB(i.e. sqrt((x+2)^2 + (y+1)^2) and equated this equation to equation 1 by elimination. After which i ended up with a wierd answer for x. Pleas etell me where I;ve gone wrong!! Any help is greatly appreciated, thnx loads!! 



#2
Aug2605, 09:27 AM

Mentor
P: 40,875

Please do not double post! http://www.physicsforums.com/showthread.php?t=86398



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