If (x-2).P(x)= 3x^3+ax-10(x2).P(x)=3x3+ax10 , what is P(-1)P(1) ?

1 Answer

From (x-2)P(x)=3x^3+ax-10(x2)P(x)=3x3+ax10 for x=2x=2 we get

(2-2)P(2)=3*2^3+2a-10=>0=14+2a=>a=-7(22)P(2)=323+2a100=14+2aa=7

Hence the relation becomes

(x-2)P(x)=3x^3-7x+10(x2)P(x)=3x37x+10

For x=-1x=1 then

(-1-2)P(-1)=-3+7+10=>P(-1)=-14/3(12)P(1)=3+7+10P(1)=143