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(x^2) - 9 is a factor of: P(x)=6(x^4)+a(x^3)-56(x^2)+bx+18 i) find a and b ii) Fully factorise i got b+9a=0 but WHY is it a=1 & b=-9?

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  • (x^2) - 9 is a factor of: P(x)=6(x^4)+a(x^3)-56(x^2)+bx+18 i) find a and b ii) Fully factorise i got b+9a=0 but WHY is it a=1 & b=-9?


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