36a2+132ab+123b2= 6a2 + 2 × 6a ×11b +11b2 + 2b2= 6a +11b2 + 2b2= 6×9 + 11× -92 +2 -72 = 54 - 772 + 98= -232 + 98 = 529 + 98 = 627
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