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R0068-34568 · q-20261005-advance-20261006-r02-quadratic-function-0068
On the full real domain, let q:R→R be q(x)=(-2)(x−(10))²+(5), with a≠0. Give the global minimum or global maximum value, according to the coefficient sign. Do not substitute a restricted interval.
G001 — On the full real domain, let q:R→R be q(x)=(-2)(x−(10))²+(5), with a≠0. Give the global minimum or global maximum value, according to the coefficient sign. Do not substitute a restricted interval.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.
Before
source roles = [qf-quadratic-function-extremum, [a, domain, h, k, operation]]
After
derived = [quadratic_extremum, reals]
Conditions: none
Separate source banks:legacy RAW SAFE with unbounded derived BigInts versus BASE Number.isInteger without invented SAFE/million caps.Operations,domains and permissive/exact keys follow THIS bank.Keep ORIGINAL JSON intact.
Rule: R68_BANK_specific_keys_operations_and_numeric_guards · Uses: G001
Before
source roles = [-2, 10, 5]
After
derived = [q(x)=a*(x-h)^2+k, x in R]
Conditions: none
FIRST qualify nonzero a and the FULL real domain.The ORIGINAL function is vertex form,not a*x²+h*x+k.Keep h/k roles unchanged and do not silently replace the domain by a bounded interval.
Rule: Quadratic_FULL_real_vertex_form_nonzero_leading_coefficient · Uses: G001, S001
Before
Quadratic ORIGINAL x minus h := sub(10, 10)
After
Quadratic ORIGINAL x minus h = 0
Conditions: none
Calculate exactly from ORIGINAL ordered operands;mul/sub/div have EXPLICITLY TWO operands.Legacy derived BigInts are not recapped at RAW SAFE;check BASE Number type/representation conditions separately.Do not use floating approximations to force an answer.
Rule: exact_rational_arithmetic · Uses: G001, S002
Before
Quadratic ORIGINAL displacement squared := mul(0, 0)
After
Quadratic ORIGINAL displacement squared = 0
Conditions: none
Calculate exactly from ORIGINAL ordered operands;mul/sub/div have EXPLICITLY TWO operands.Legacy derived BigInts are not recapped at RAW SAFE;check BASE Number type/representation conditions separately.Do not use floating approximations to force an answer.
Rule: exact_rational_arithmetic · Uses: G001, S003
Before
Quadratic ORIGINAL a times displacement squared := mul(-2, 0)
After
Quadratic ORIGINAL a times displacement squared = 0
Conditions: none
Calculate exactly from ORIGINAL ordered operands;mul/sub/div have EXPLICITLY TWO operands.Legacy derived BigInts are not recapped at RAW SAFE;check BASE Number type/representation conditions separately.Do not use floating approximations to force an answer.
Rule: exact_rational_arithmetic · Uses: G001, S004
Before
Quadratic ORIGINAL weighted square plus k := sum(0, 5)
After
Quadratic ORIGINAL weighted square plus k = 5
Conditions: none
Calculate exactly from ORIGINAL ordered operands;mul/sub/div have EXPLICITLY TWO operands.Legacy derived BigInts are not recapped at RAW SAFE;check BASE Number type/representation conditions separately.Do not use floating approximations to force an answer.
Rule: exact_rational_arithmetic · Uses: G001, S005
Before
source roles = [-2, 10, 5]
After
derived = [(x-h)^2>=0 for ALL real x, q(x)<=k, q(h)=k, global maximum=5]
Conditions: none
For EVERY real x,the square is nonnegative.Positive a preserves≥;negative a reverses it to≤.Adding k gives the GLOBAL bound,and x=h ATTAINS k.The other direction is unbounded as|x-h|→infinity;do not invent finite extrema in both directions.
Rule: Quadratic_UNIVERSAL_square_sign_global_bound_AND_attainment · Uses: G001, S006
S007 · premise_and_result_audit — Reverse-check THIS question’s ORIGINAL givens,domain and step premises.Preserve originals/English/MKOs/ASTs/status;do not reverse a one-way implication or call finite checks independent review or general formal proof.S006 · premise_and_result_audit — Recompute Quadratic ORIGINAL weighted square plus k with exact rational arithmetic, not rounded decimals.S005 · premise_and_result_audit — Recompute Quadratic ORIGINAL a times displacement squared with exact rational arithmetic, not rounded decimals.S004 · premise_and_result_audit — Recompute Quadratic ORIGINAL displacement squared with exact rational arithmetic, not rounded decimals.S003 · premise_and_result_audit — Recompute Quadratic ORIGINAL x minus h with exact rational arithmetic, not rounded decimals.S002 · premise_and_result_audit — Reverse-check THIS question’s ORIGINAL givens,domain and step premises.Preserve originals/English/MKOs/ASTs/status;do not reverse a one-way implication or call finite checks independent review or general formal proof.S001 · premise_and_result_audit — Reverse-check THIS question’s ORIGINAL givens,domain and step premises.Preserve originals/English/MKOs/ASTs/status;do not reverse a one-way implication or call finite checks independent review or general formal proof.global maximum=5
The full substitutions and premise checks give the original answer; source identity,format and status are unchanged.
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.
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