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(i) x² +4x -4x - (4x4) = x² -16
(ii) x² +4x +4x + (4x4) = x² +8x +16
(iii) x² +6x +6x + (6x6) = x² +12x +36
(iv) x² -6x +6x + (6x6) = x² + 36