book Maths Puzzle Numerical Ability

Find a polynomial of the lowest degree with only real coefiecients and having the given zeroes
-5i amd rad 2

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book Other Question

My question is:
The length, width, and height of a rectanglar box are consecutive integers,and the largest dimension is k cm. Find the volume V of the box. (hint: V=lwh)
find g for S =140, t=2