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![[Post New]](/templates/default/images/icon_minipost_new.gif) 19 Jun 2007 23:14:32 IST
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hi...guyz n galz... The killer series is back.....n its time to switch ur bulbs on...lol last time....i stopped at the 11th killer ques...so , 2 begin with , here is an easy 12th one...... Q. consider a quadratic Ax^2 + Bx + C = 0 It has two distinct positive integers as roots and ( A + B + C ) is a prime no. also , the quadratic takes the value ( - 55 ) for some integral value of x .... Evaluate the roots of the quadratic.... rating points - 4 salutes.... and as usual....those people are not invited who know from where to get the solutions from some arbitrary resources ....
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............tseb eht ma i |
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19 Jun 2007 23:20:20 IST
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this should be bread and butter for all of you....c'monnn...
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............tseb eht ma i |
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19 Jun 2007 23:25:32 IST
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any doubts in the question...
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............tseb eht ma i |
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19 Jun 2007 23:45:35 IST
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is it dat tough....
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............tseb eht ma i |
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20 Jun 2007 00:40:18 IST
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shud i start givin clues...
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............tseb eht ma i |
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20 Jun 2007 01:24:09 IST
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its strange.....quadratic is such a simple topic....
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............tseb eht ma i |
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20 Jun 2007 12:19:31 IST
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the answer wud be revealed in 2 hrs..
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............tseb eht ma i |
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20 Jun 2007 12:53:16 IST
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Does evrybdy give up....  ..
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............tseb eht ma i |
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20 Jun 2007 13:30:32 IST
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ok....last offer....even the experts are invited.....
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............tseb eht ma i |
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20 Jun 2007 14:08:08 IST
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roots r 2&18
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KINDLY RATE ME 4 MY EFFORTS PLZZZZZZZZZ......... |
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20 Jun 2007 14:08:54 IST
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is the answer in terms of a,b,c?
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what is 2+2=
(a)4
(b)four
(c)iv
(d)1+3
I always knew iit is so tough!!!!! |
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20 Jun 2007 14:15:53 IST
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ok , lazycol is perfectly correct........
but for ratings....i want a proper proof....
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............tseb eht ma i |
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20 Jun 2007 14:30:12 IST
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its purely a logical proof roots r +ve integers ie a=1 a+b+c is prime;b,c cant b 0 ie prime is odd;sum of 2 even no: & an odd; so b&c r even ie roots r even roots r integers means b2-4c is a perfect square at x=an integer value of exp. is -55ie x2+bx+c-55 have integral sol ie b2-4(c+55)is a perfect sq so b2-4c &b2-4c-220 r perfect sq dis works with 36&256 roots r (-b  16)/2 = -b/2 8 roots r +ve b<-16&b is even put b=-20,sol r 2&18
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KINDLY RATE ME 4 MY EFFORTS PLZZZZZZZZZ......... |
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