exam Maths Puzzle Numerical Ability

find all the sixth roots of (12+5i)?

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exam Other Question

Let P(x)=X^4-5X^3-X^2+40X-70.
I need to know all of the zero's. I already did the syndiv, and I have the upper bound at 6 and the lower bound at 3. Because the X^4 I know that the 14b = 16(b + 12)