Using (X + A) (X + B) = X2 + (A + B) X + Ab, Find 103 × 104

Using (x + a) (x + b) = x² + (a + b) x + ab, find 103 × 104

103 × 104 = (100 + 3) (100 + 4)

= (100)² + (3 + 4) (100) + (3) (4)

= 10000 + 700 + 12 = 10712

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