exam Maths Puzzle Numerical Ability

How do I express as a polynomial? (x-4)(2x+3)

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exam Other Question

This is a problem I have run into here at work. I need to solve for x in the following equation. Thanks for the help.
S=(1440*T)/(N*x*pi^2*D^2*acos((D-x)/D)) solve by completing the square 2m^2-m-15=0?