exam Maths Puzzle Numerical Ability

p.16 #23
I cannot figure out how to create an equation from the following complex numbers
a) 2+i and 2-i
b) 3+2i and 2-3i

thaks!

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exam Other Question

Find the first five outputs of the following recursively defined function:

f(1)=8,(thats given) f(n+1)=-f(n)+6

its not really a permutation but i didnt know what category to put it in
Can you factor (tł-8)?