True, x-3 and -3x are unlike terms., The polynomial (abc)2 – 100b4 factors completely as -> (abc – 10b2)(abc + 10b2), Factor the polynomial -6x2 + 53x – 40. -> (-6x + 5)(x – 8), False, x2 and 2x are like terms., Factor the polynomial 25x2 – 30xy + 9y2. -> (5x + 3y)(5x – 3y)

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