book Maths Puzzle Numerical Ability

simplify

4x-7/2(6)+x[8(4)/2x]

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Need help with the following:

Suppose that a polynomial function of degree 4 with rational coefficients has -1, 0, and 2 - 3i as zeros. What is the remaining zero?
A circle with radius 10 and center (h,6) passes through the points (8,-2). Find the possible values of h.
a. 2 or 8
b. 2 or -6
c. -6 or 14
d. 2 or 14

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