Book Maths Puzzle Algebra

How do I factor this polynomial? And if it's prime, say so.
9x^2+6x+3

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Book Other Question

quadratic functions:
f(x)=2x^2-1
f(x)=8-x-x^2
y=x^2+5
Describe the y-intercept of the graph of a quadratic function?????
How can I answer that?
Thanks for your help. How do I convert 5.5% to a decimal to figure out sale tax on items purchased?