find the value of a and b so that x^4+x^ 3+8×^2+ ax=b is divisible by (x^ 2+1)
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firstly find the roots of x2+1 with factorisation
then substitute both roots in equation
u will get 2 equations
solve them
that's it
then substitute both roots in equation
u will get 2 equations
solve them
that's it
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