Key Terms:
polynomial, coefficients, simplification, like terms
In this situation, simplifying a polynomial requires identifying the unknown coefficients for "x" and the constant term. By definition, a polynomial has the structure:
. Where:
a, b, c, d, e, and f signify the coefficients.
n, n-1, 3, 2, 1, 0 are the respective exponents, and "n" denotes the degree of the polynomial due to being the largest exponent.
x is the variable in question.
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To simplify, it's necessary to combine like terms, keeping in mind that opposite signs result in subtraction while the dominant sign prevails.

Comparing to the provided simplified polynomial yields:

Hence we conclude with 

Conclusion:

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