(3x-4y)² (9x²+12xy+16y²)
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3x + 4y = 16 (3x + 4y)^2 = 16^2 = 256 9x^2 + 16y^2 + 24xy = 256 9x^2 + 16y^2 = 256 - 24xy = 256 ... 9x²+16y²=256–24xy=256–96= 160.
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