exam Maths Puzzle Numerical Ability

divide 5+ 3j over 2 + j I did the next step and came up with
10 - j5 + j6 -1 over 2^2 - (j^2)^2 I don't know if I did that right and not sure what to do next.

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exam Other Question

Explain why we cannot square a sum by simply squaring each term of the sum. For example, (a+b)square 2 is not equal to a square + b square. Provide appropriate example. Hi! I really need help with this question. I have no idea how to answer it. Please help. It says to: Use the quadratic forumula to solve the following. Leave irrational roots in the simplest form.
3x^2-4x-5=0
Thank You=)