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...Solución...
(3x-3y)^2
(3x)^2+2(3x)(-3y)+(-3y)^2
9x^2-18xy+9y^2
Saludos...
Propiedad : (a-b)²=a²-2ab+b²
Aplicamos :)
(3x-3y)² = (3x)²-2(3x)(3y)+(3y)²
9x²-18xy+9y²
Respuesta: 9x²-18xy+9y²
Suerte y saludos !!