exam Maths Puzzle Numerical Ability

what is m-8 divided by m squared minus 7m minus 8
m+7

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exam Other Question

for i= square root -1, if 3i(2+5i)=x+6i, then x=? Find the missing polynomials.

(5a^3-3a^2b+ab^2+b^3)+(a^3+a^2b+4ab^2+b^3)+ (unknown) =3a^3-2a^2b+ab^2-2b^3