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Which polynomial is written in descending order?

A. 9-3x+4x²

B. - 3x+9+4x²

C. 4x²-3x+9

D. 4x²+9-3x

If it's descending order for x then, it should be C, because it goes in order of x^2 then x and finally no x.

Answer is choice C) 4x^2-3x+9

You list off the terms in a way where the largest exponent term comes first, then the second largest exponent is next, and so forth. Note how the last term 9 is the same as 9x^0. The term 3x is equivalent to 3x^1. So what we really have is 4x^2-3x^1+9x^0. The exponents count down: 2, 1, 0