The set of all real numbers a such that ...

The set of all real numbers `a` such that `a^2+2a ,2a+3,a n da^2+3a+8` are the sides of a triangle is_____

A

`agt5`

B

`alt-5`

C

`agt(-11)/(3)`

D

`a in R`

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The correct Answer is:

A

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