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(i) \((2x + 3)(2x – 4)\) (=\) iii−ii−i

(ii) \((y2 – 4)(2y2 + 3y)\) = iii+iii−iii−ii

(iii) \((m^2 – n)(5m^2n^2 – n^2)\) \(=\)
 iiiii−iiii−iiiii+ii

(iv) \(3(x – 5) × 2(x – 1)\) \(=\) iii−ii+i