exam Maths Puzzle Numerical Ability

f(x)=x^2-3 How do I solve this problem I have tried several times and I do not think I have the right answer

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Multiply.
71. (X-1/2)(2X^3-4X^2+3X-2/5) find values of a and b such that a is a whole number, b is a rational number but not an integer, and a/b=-8