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Q.

The number of real roots of the equation  x|x|5|x+2|+6=0  is 

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a

6

b

3

c

4

d

5

answer is C.

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Detailed Solution

  If  x<2x2+5(x+2)+6=0
   x25x16=0                         
  b24ac=25+64=89>0                          

 If  2<x<0x25(x+2)+6=0
x2+5x+4=0                                  
x=1,4    but  4(2,0)
         If  x<2x2+5x+16=0
          b24ac<0 , so no real roots.
 

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