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(2k+7)^2 = (2k)² + 2(2k)(7) + (7)² = 4k² + 28k + 49
(4m+3r)^2 = (4m)² + 2(4m)(3r) + (3r)² = 16m² + 24mr + 9r²
(5a+3b)^2 = (5a)² + 2(5a)(3b) + (3b)² = 25a² + 30ab + 9b²
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