exam Maths Puzzle Numerical Ability

Hi, ive been asked to answer the following questions, and having great difficulty, i have managed to answer the first question, (although with ALOT of help), but i was wondering if

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exam Other Question

Use synthetic division to find the value of f (-2) for f (x) =
x ^3 - 3x^2 - x - 9.
Please Help! How do you solve the equation
m - 2n = 9 if the domain is {-1, 0, 5}.