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The polynomial 7x3 + 6x2 - 2 has a degree of 3, making it cubic.
The degree is the highest power of the variable. For example, x5 + 3x3 - x + 4 is of degree 5, since the highest power of "x" is 5.
Yes, f(x) = 2 is a polynomial of degree 0 (because there are no x terms).
Yes. If the coefficient of the third degree terms in one polynomial are the additive inverses (minus numbers) of the coefficient of the corresponding terms in the second polynomial. Eg: 3x3 + 2x2 + 5 and -3x3 + x - 7 add to give 2x2 + x - 2
Yes. If and only if the coefficients of x4 are of the same magnitude and opposite sign.