(2X + 3y)^2= 4x^2 + 9y^2 + 2×2x × 3y = 4x^2 + 9y^2 + 12XY= 69 + 12×1= 81hence (2x + 3y)^2 = 81so2x+3y = √812x + 3y = 9
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