Factorise 9(x+y)^2-24(x^2-y^2)+16(x-y)^2
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Step-by-step explanation:
{3(x+y)}² -2×3×4(x+y)(x-y)+{4(x-y)}²
(3x+3y-4x+4y)²
(7y-x)²
49y²-x²
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