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Question
Using (x + a) (x + b) = x2 + (a + b) x + ab, find 103 × 98
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Solution
103 × 98 = (100 + 3) (100 − 2)
= (100)2 + [3 + (− 2)] (100) + (3) (− 2)
= 10000 + 100 − 6
= 10094
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