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Question
Using (x + a) (x + b) = x2 + (a + b) x + ab, find 103 × 104
Solution
103 × 104 = (100 + 3) (100 + 4)
= (100)2 + (3 + 4) (100) + (3) (4)
= 10000 + 700 + 12 = 10712
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