exam Maths Puzzle Numerical Ability

Factor completely.
16x^2 - 2x - 3

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exam Other Question

Can someone help me on this problem with the graph? Stanborn has been so kind on working out the problem, but I have to send this through the computer and I am having trouble maki I need to know the rules for signed number arithmetic ie: when adding like signs..., unlike..., subtraction, multiplication, division... Thank you!