Theory of Equations 1 Question 50

51. For a0, determine all real roots of the equation

x22a|xa|3a2=0

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Solution:

  1. Here, a0

Given, x22a|xa|3a2=0

Case I When xa

x22a(xa)3a2=0x22axa2=0x=a±2a

[as a(1+2)<a and a(12)>a ]

Neglecting x=a(1+2) as xa

x=a(12)

Case II When x<ax2+2a(xa)3a2=0

x2+2ax5a2=0x=a±6a

 [as a(61)<a and a(16)>a ] 

Neglecting x=a(16)x=a(61)

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

x=a(12),a(61)



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