(i) 2x(3x + 5xy) = 2x x 3x + 2x x 5xy = (2 x 3) X x X x + (2 x 5) X x X xy = 6x2 + 10x2y(ii) a2(2ab - 5c) = a2 x 2ab + a2 x (-5c) = (a x 2) x a2 x ab + [1 x (- 5)] x a2 x c = 2 x a2b + (- 5) x a2c = 2a3b - 5a2c
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