Explore related knowledge and questions →

Question 4227: Complete Polynomial Product Coefficients

On this page
  1. Original question and givens
  2. Definition and scope
  3. Step-by-step derivation
  4. Reverse checks
  5. Result
  6. This question review and source binding

Return to catalogue page 22

← Question derivation index · Original question batch

R0007-04227 · q-20261008-advance-20261010-r01-polynomial-0027

Original question and givens

Integer polynomials have ascending coefficients f=[2] and g=[-3], constant term first. Give the complete ascending coefficients of fg, potentially through degree 6, without truncation.

  • G001 — Integer polynomials have ascending coefficients f=[2] and g=[-3], constant term first. Give the complete ascending coefficients of fg, potentially through degree 6, without truncation.

Definition and scope

Use the original question domain, assumptions and cited MKO definitions. This item has second-context mathematical and bilingual review, with the model, answer and every arithmetic step independently recomputed from the original parameters; the source question remains a candidate.

Step-by-step derivation

S001 · implies

Before

f ascending coefficients=[2]

After

coefficient k multiplies x^k;keep all required degrees

Conditions: none

Coefficients are in ascending powers with the constant at index0.Full coefficient operations are not identities inferred from one-point agreement;retain the original coefficient list.

Step identifiers and dependencies

Rule: ascending_polynomial_identity · Uses: G001

S002 · calculation

Before

product term degrees0,0 := mul(2, -3)

After

product term degrees0,0 = -6

Conditions: none

Distributivity gives c_i d_j x^(i+j);multiply the coefficients first.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S001

S003 · implies

Before

degrees 0+0

After

contribute -6 to degree0

Conditions: none

Add degrees and assign the term to that coefficient bucket,retaining the full summed degree.

Step identifiers and dependencies

Rule: polynomial_convolution_term · Uses: G001, S002

S004 · calculation

Before

product coefficient0 := sum(-6)

After

product coefficient0 = -6

Conditions: none

Sum every coefficient product with i+j=k,without truncating high powers.

Step identifiers and dependencies

Rule: exact_rational_arithmetic · Uses: G001, S003

S005 · implies

Before

[-6]

After

canonical ascending coefficient list

Conditions: none

The full finite convolution gives the product;two cubic factors may produce degree6,and a zero factor produces[0].

Step identifiers and dependencies

Rule: polynomial_product_coefficients · Uses: G001, S004

Reverse checks

  • S005 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S004 · premise_and_result_audit — Recompute product coefficient0 with exact rational arithmetic, not rounded decimals.
  • S003 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.
  • S002 · premise_and_result_audit — Recompute product term degrees0,0 with exact rational arithmetic, not rounded decimals.
  • S001 · premise_and_result_audit — Check against the original data and this step's premises; a one-way implication is not an equivalence.

Result

[-6]

The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.

This question review and source binding

Review date: 2026-10-26

Original questions, answers, step expressions, numeric ASTs and historical records are retained. Source candidate labels remain historical and are not overwritten as formal proof.

Source hashes and review receipts
  • input commit: 0f7be61e2c22317a4075561dc822c87d881a50db
  • original question SHA-256: f04997fc7141b88bd485b43ac01ee8c0873f1868bf84a0ccf53ab3bc1d6cb77a
  • candidate record SHA-256: 5da9b82a466887e0554bf233d6768765ab061b97865b9255fd8f55f236da8c25
  • semantic review receipt SHA-256: faf0582c0184613e6fae207374056133eae600883a29c67d8438113bbe3c485a
  • question-first witness SHA-256: 4b283b6ff424b1d22caa36f3552b0fa21b1b66a0a883d7cbe9cedc8dd77b2e42
  • Lean: NOT_RUN · human review: NOT_PERFORMED
Same-source full JSON