1.

IFsqrt( x^2 + 4a +5 )+ sqrt( x^2 + 4b+ 5 )=2 (a-b)thenx=

Answer»

`((a-b)^2 -5)/(2(a+b))`
`(a^2-b^2)/(2(a+b))`
` ((a+b)^2)/((a+b)-5)`
none

Answer :A


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