exam Maths Puzzle Numerical Ability

Add the following polynomials:

(5b^3 - 8b + 2b^2) + (3b^2 - 7b^3 + 5b)

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exam Other Question

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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