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# Factorise (i) 30x3y + 24x2y2 – 6xy(ii) 5x(a – b) + 6y(a –b)

(i) The greatest monomial that is a common factor of the three terms is 6xy.
...    30x3y + 24x2y2 - 6xy = 6xy(5x2 + 4xy – 1)

(ii) Here the polynomial (a – b) is a common factor.
...5x(a – b) + 6y(a – b) = (a – b)(5x + 6y)

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