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Q.

Let  a,b,c,d be distinct real numbers and  a and b are the roots of quadratic equation x22cx5d=0  , If  c and d are the roots of the quadratic equation  x22ax5b=0 then find the numerical value of (a+b+c+d)2 

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a

100

b

400

c

200

d

900

answer is D.

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Detailed Solution

  a+b=2c,c+d=2aa+c=b+d
a&c satisfy (1) & (2) equation respectively  a22ac5d=0&c22ac5b=0  on adding both equations 
(a+c)22ac5(b+d)=0
(a+c)25(a+c)150=0  (as ab.cd=5d×5b  )
a+c=15a+b+c+d=30
 

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