Classify nonzero one-variable polynomials by degree and number of terms, and identify their degree and leading coefficient, including constants, missing powers, and negative or fractional coefficients. Evaluate one- or multivariable polynomial expressions for specified real values, and add or subtract polynomials by managing signs, distributing negatives, and combining like terms in standard form. Multiply monomials by polynomials and one-variable binomials using the distributive property and exponent laws, and expand the special products for binomial squares and conjugates.