Question 32810: Both Values in a Matrix Additivity Identity

Original question and givens

Over R, the 2×2 matrix is M=[[-3, 2], [-2, 10]]. In the fixed standard basis, T:R²→R² is T(x)=Mx, with column vectors. For u=[9, 1] and v=[-9, 1], compute T(u+v) and T(u)+T(v). Answer as left vector = right vector.

• G001 — Over R, the 2×2 matrix is M=[[-3, 2], [-2, 10]]. In the fixed standard basis, T:R²→R² is T(x)=Mx, with column vectors. For u=[9, 1] and v=[-9, 1], compute T(u+v) and T(u)+T(v). Answer as left vector = right vector.

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.

• mko-linear-transformation

Step-by-step derivation

source roles = [qf-linear-map-additivity-values, additivity_values, reals, []]

derived = [[VECTOR_EQUALS_VECTOR_STRING]]

Additivity ORIGINAL u plus v ORIGINAL component0 := sum(9, -9)

Additivity ORIGINAL u plus v ORIGINAL component0 = 0

Additivity ORIGINAL u plus v ORIGINAL component1 := sum(1, 1)

Additivity ORIGINAL u plus v ORIGINAL component1 = 2

Additivity LEFT M of sum ORIGINAL row0 column0 product := mul(-3, 0)

Additivity LEFT M of sum ORIGINAL row0 column0 product = 0

Additivity LEFT M of sum ORIGINAL row0 column1 product := mul(2, 2)

Additivity LEFT M of sum ORIGINAL row0 column1 product = 4

Additivity LEFT M of sum ORIGINAL row0 two products sum := sum(0, 4)

Additivity LEFT M of sum ORIGINAL row0 two products sum = 4

source roles = [Additivity LEFT M of sum, 0, [-3, 2], [0, 2]]

derived = [[0, 4], 4]

Additivity LEFT M of sum ORIGINAL row1 column0 product := mul(-2, 0)

Additivity LEFT M of sum ORIGINAL row1 column0 product = 0

Additivity LEFT M of sum ORIGINAL row1 column1 product := mul(10, 2)

Additivity LEFT M of sum ORIGINAL row1 column1 product = 20

Additivity LEFT M of sum ORIGINAL row1 two products sum := sum(0, 20)

Additivity LEFT M of sum ORIGINAL row1 two products sum = 20

source roles = [Additivity LEFT M of sum, 1, [-2, 10], [0, 2]]

derived = [[0, 20], 20]

Additivity RIGHT M of u ORIGINAL row0 column0 product := mul(-3, 9)

Additivity RIGHT M of u ORIGINAL row0 column0 product = -27

Additivity RIGHT M of u ORIGINAL row0 column1 product := mul(2, 1)

Additivity RIGHT M of u ORIGINAL row0 column1 product = 2

Additivity RIGHT M of u ORIGINAL row0 two products sum := sum(-27, 2)

Additivity RIGHT M of u ORIGINAL row0 two products sum = -25

source roles = [Additivity RIGHT M of u, 0, [-3, 2], [9, 1]]

derived = [[-27, 2], -25]

Additivity RIGHT M of u ORIGINAL row1 column0 product := mul(-2, 9)

Additivity RIGHT M of u ORIGINAL row1 column0 product = -18

Additivity RIGHT M of u ORIGINAL row1 column1 product := mul(10, 1)

Additivity RIGHT M of u ORIGINAL row1 column1 product = 10

Additivity RIGHT M of u ORIGINAL row1 two products sum := sum(-18, 10)

Additivity RIGHT M of u ORIGINAL row1 two products sum = -8

source roles = [Additivity RIGHT M of u, 1, [-2, 10], [9, 1]]

derived = [[-18, 10], -8]

Additivity RIGHT M of v ORIGINAL row0 column0 product := mul(-3, -9)

Additivity RIGHT M of v ORIGINAL row0 column0 product = 27

Additivity RIGHT M of v ORIGINAL row0 column1 product := mul(2, 1)

Additivity RIGHT M of v ORIGINAL row0 column1 product = 2

Additivity RIGHT M of v ORIGINAL row0 two products sum := sum(27, 2)

Additivity RIGHT M of v ORIGINAL row0 two products sum = 29

source roles = [Additivity RIGHT M of v, 0, [-3, 2], [-9, 1]]

derived = [[27, 2], 29]

Additivity RIGHT M of v ORIGINAL row1 column0 product := mul(-2, -9)

Additivity RIGHT M of v ORIGINAL row1 column0 product = 18

Additivity RIGHT M of v ORIGINAL row1 column1 product := mul(10, 1)

Additivity RIGHT M of v ORIGINAL row1 column1 product = 10

Additivity RIGHT M of v ORIGINAL row1 two products sum := sum(18, 10)

Additivity RIGHT M of v ORIGINAL row1 two products sum = 28

source roles = [Additivity RIGHT M of v, 1, [-2, 10], [-9, 1]]

derived = [[18, 10], 28]

Additivity RIGHT images sum ORIGINAL component0 := sum(-25, 29)

Additivity RIGHT images sum ORIGINAL component0 = 4

Additivity RIGHT images sum ORIGINAL component1 := sum(-8, 28)

Additivity RIGHT images sum ORIGINAL component1 = 20

source roles = [additivity_values, [[-3, 2], [-2, 10]], [9, 1], [-9, 1]]

derived = [[4, 20], [4, 20], [4, 20] = [4, 20]]

Reverse checks

• S030 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
• S029 · premise_and_result_audit — Recompute Additivity RIGHT images sum ORIGINAL component1 with exact rational arithmetic, not rounded decimals.
• S028 · premise_and_result_audit — Recompute Additivity RIGHT images sum ORIGINAL component0 with exact rational arithmetic, not rounded decimals.
• S027 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
• S026 · premise_and_result_audit — Recompute Additivity RIGHT M of v ORIGINAL row1 two products sum with exact rational arithmetic, not rounded decimals.
• S025 · premise_and_result_audit — Recompute Additivity RIGHT M of v ORIGINAL row1 column1 product with exact rational arithmetic, not rounded decimals.
• S024 · premise_and_result_audit — Recompute Additivity RIGHT M of v ORIGINAL row1 column0 product with exact rational arithmetic, not rounded decimals.
• S023 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
• S022 · premise_and_result_audit — Recompute Additivity RIGHT M of v ORIGINAL row0 two products sum with exact rational arithmetic, not rounded decimals.
• S021 · premise_and_result_audit — Recompute Additivity RIGHT M of v ORIGINAL row0 column1 product with exact rational arithmetic, not rounded decimals.
• S020 · premise_and_result_audit — Recompute Additivity RIGHT M of v ORIGINAL row0 column0 product with exact rational arithmetic, not rounded decimals.
• S019 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
• S018 · premise_and_result_audit — Recompute Additivity RIGHT M of u ORIGINAL row1 two products sum with exact rational arithmetic, not rounded decimals.
• S017 · premise_and_result_audit — Recompute Additivity RIGHT M of u ORIGINAL row1 column1 product with exact rational arithmetic, not rounded decimals.
• S016 · premise_and_result_audit — Recompute Additivity RIGHT M of u ORIGINAL row1 column0 product with exact rational arithmetic, not rounded decimals.
• S015 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
• S014 · premise_and_result_audit — Recompute Additivity RIGHT M of u ORIGINAL row0 two products sum with exact rational arithmetic, not rounded decimals.
• S013 · premise_and_result_audit — Recompute Additivity RIGHT M of u ORIGINAL row0 column1 product with exact rational arithmetic, not rounded decimals.
• S012 · premise_and_result_audit — Recompute Additivity RIGHT M of u ORIGINAL row0 column0 product with exact rational arithmetic, not rounded decimals.
• S011 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
• S010 · premise_and_result_audit — Recompute Additivity LEFT M of sum ORIGINAL row1 two products sum with exact rational arithmetic, not rounded decimals.
• S009 · premise_and_result_audit — Recompute Additivity LEFT M of sum ORIGINAL row1 column1 product with exact rational arithmetic, not rounded decimals.
• S008 · premise_and_result_audit — Recompute Additivity LEFT M of sum ORIGINAL row1 column0 product with exact rational arithmetic, not rounded decimals.
• S007 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.
• S006 · premise_and_result_audit — Recompute Additivity LEFT M of sum ORIGINAL row0 two products sum with exact rational arithmetic, not rounded decimals.
• S005 · premise_and_result_audit — Recompute Additivity LEFT M of sum ORIGINAL row0 column1 product with exact rational arithmetic, not rounded decimals.
• S004 · premise_and_result_audit — Recompute Additivity LEFT M of sum ORIGINAL row0 column0 product with exact rational arithmetic, not rounded decimals.
• S003 · premise_and_result_audit — Recompute Additivity ORIGINAL u plus v ORIGINAL component1 with exact rational arithmetic, not rounded decimals.
• S002 · premise_and_result_audit — Recompute Additivity ORIGINAL u plus v ORIGINAL component0 with exact rational arithmetic, not rounded decimals.
• S001 · premise_and_result_audit — Reverse-check ORIGINAL data,field roles,types,domain and premises;the conclusion need not uniquely recover its premises.Keep source-bound candidates,independent review,formal proof and publication separate.

Result

[4, 20] = [4, 20]

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.