Using (x + a) (x + b) = x + (a + b)x + ab, find (i) 103 x 104

Using (x + a) (x + b) = x + (a + b)x + ab, find
(i) 103 x 104
(ii) 5.1 x 5.2
(iii) 103 x 98
(iv) 9.7 x 9.8

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