polynomial

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Across
  1. 2. of adding terms (6 letters) - SUBTRACT
  2. 5. like 2x^2 + 3x (7 letters) - BINOMIAL (This replaces the previous "four" clue)
  3. 6. (Examples):
  4. 8. with only one term (4 letters) - MONOMIAL
  5. 9. of x^2 in 3x^2 (1 letter) - trinomial
Down
  1. 1. without a variable (5 letters) - CONSTANT
  2. 3. with a constant term (9 letters) - CONSTANT TERM
  3. 4. highest power of a variable in a polynomial (5 letters) - DEGREE
  4. 6. like terms in a polynomial (7 letters) - ADDITION
  5. 7. variable used in a polynomial expression (1 letter) - X