exam Maths Puzzle Numerical Ability

Learning algebra as it applies to electronics. Having trouble with this one because I do not know what to do with the 1/2 shown in the equation.

x= -1/ [2phi(FC)1/2]

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FIND ALL RATIONAL ZEROS AND FACTOR f(X).
F(X)=X^3+2X^2-45X-126 How do u do monomials? here is some examples of an monomials.......(2e over 3)with the exponet 2 out side the ().