book Maths Puzzle Numerical Ability

Hello!
I really need help understanding polynomials. Could someone help me undestand how to factor this problem?

15x^2-1x-2

Thank very much!

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book Other Question

I need to know how to find the radius and center of x2 - 2x + y2 � 16y = � 1. Could you please show me all steps taken to obtain an answer for the following word problem:

A manufacturer makes silver rings and bracelets. Rings require 5 grams of silver and