Solve using factor theorem (picture attached)
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2x -1 = 0
x =1/2
Now, putting the value of x in p(x)
2x^4 - ax ^3+ 8x ^2 -x +4
= 1-a/8 + 16 +4
=21 - a /8 = 0
a/8=21
a = 21/8
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