book Maths Puzzle Numerical Ability

Hi I am trying to seperate the following into its real and imaginary parts, but I cannot remember how to do this:
(jwl - j/wc)/(R+jwl - j/wc)
I have tried using the complex con

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book Other Question

Q. If one complex zero of a quadratic equation is 2 + i, what is the quadratic equation in ax^2 + bx + c = 0
thanks, Mike
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