If x =1/2 is a zero of the polynomial p(x)=8x^3-ax^2-x+2, find the value of a.
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given, x = 1/2
8x³-ax²-x+2 = 0
8(1/2)³-a(1/4)-(1/2)+2 = 0
a/4 = 1-(1/2)+2
a/4 = (1/2)+2
a/4 = 5/2
a = 10
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