determine the value of a such that x-4 is the factor of the polynomial 2x^3+ax^2+27x-28
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x-4=0. x=4.
p (x)=2x^3+ax^2+27x-28.
p (4)=2. (4)^3+a. (4)^2+27.4-28
=2.64+16a+108-28.
=128+16a+80.
-16a =208.
a=208/-16.
=-13.
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