find the value of a if x cube minus a x square + 6 x minus a is exactly divided by x + 3
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P(x)=x³-ax²+6x-a
P(3)=3³-a3²+6*3-a
= 27-9a+18-a
0=45-10a
10a=45
a=4.5
P(3)=3³-a3²+6*3-a
= 27-9a+18-a
0=45-10a
10a=45
a=4.5
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