Theory of Equations 1 Question 49

50. Solve |x2+4x+3|+2x+5=0

(1987, 5M)

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Solution:

  1. Given, |x2+4x+3|+2x+5=0

Case I x2+4x+3>0(x<3 or x>1)

x2+4x+3+2x+5=0

x2+6x+8=0(x+4)(x+2)=0

x=4,2 [but x<3 or x>1 ]

x=4 is the only solution.

Case II x2+4x+3<0(3<x<1)

x24x3+2x+5=0

x2+2x2=0(x+1)2=3

|x+1|=3

x=13,1+3 [but x(3,1)]

x=13 is the only solution.

From Eqs. (i) and (ii), we get

x=4 and (13) are the only solutions.



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