exam Maths Puzzle Numerical Ability

Hi!
Please help me, with this question, the problem says:
Evaluate each of the following if a=3 and b=4
(a-b)^3
Please and Thank You=)

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exam Other Question

The degree three polynomial f(x) with real coefficients and leading coefficient 1, has -3 and +4i among its roots. Express f(x) as a product of linear and quadratic polynomials with real coefficients. for which of the following situation would you use the multiplication counting principle?
a. selecting 6 CDs from a collection of 50
b. arranging wardrobe options of jeans and sw