Book Maths Puzzle Algebra

I can get the answer for 3i, -3i, but not this one.
Thanks for the help!!

Write a quadratic equation having the given numbers as solutions

5-2i, 5+2i

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Book Other Question

how do i solve this?
3a^3(2a-7)?
What is 1/8 of 10% of $1,883,824.25?