book Maths Puzzle Numerical Ability

How do I divide this equation using a+bi form 6/2+4i

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book Other Question

graph the rational function

x^2 - 4/x - 1
Let Pn[X] be the vector space of all polynomials of degree <=n, prove that the set (1,x,x(x-1),x(x-1)(x-2),...,x(x-1)(x-2)***(x-n+1)) is a basis for this vector space.

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