10. Evaluate using proper identity:
(1)93 x 96
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Answer:
93 × 96 = (100 - 7)(100 - 4)
We know that:
(x - a)(x - b) = x^2 - x(a + b) + ab
(100 - 7)(100 - 4) = 10000 - 100(7 + 4) + 28
= 10000 - 1100 + 28
= 8928
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