Answer :

We have,

p (x) = 8xax+ 2

Put x =

p () = 8 ()3 – a ()2 – () + 2

= 8 ×  – a ×  + + 2

= -1 - + + 2

= -

Given that,

x =  is a root of p (x)

p () = 0

Therefore,

- = 0

=

2a = 12

a = 6

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