I am assuming this is: .2x4 - 5x2 - 7x, which would be a Quartic Polynomial.
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Yes. If you add, subtract or multiply (but not if you divide) any two polynomials, you will get a polynomial.
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18 because, 5x2=10 10+8=18! Your welcome. It's not a problem at all. I love math!
5x2-16x+12 = (5x-6)(x-2) when factored
(5x + 2)(x + 1)