book Maths Puzzle Numerical Ability

what is a pollynomial? and also, how do you factor problems such as:

2xsquared-7x-4

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book Other Question

Rewrite the expression using positive exponents. 5AB^-2 Subtract. Express result in simplest form.

(3)/(x^2 + 4x + 3) minus (1)/(x^2 - 9)

Thanks!