First decompose the factor, then evaluate it: 9x2 + 12xy + 4y2, where x = 43, y = − 12

9x2 + 12xy + 4y2 = (3x + 2Y) 2, ∵ x = 43, y = − 12, the original formula = [3 × 43 + 2 × (- 12)] 2 = 9

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