Question

Evaluate using suitable identities.
a) 297 x 303
b)

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Answer 1

$297 \times 303 \\ (300 - 3) \times (300 + 3) \\ (a + b)(a - b) = a { }^{2} { - b}^{2} \\ = 300 {}^{2} - 3 {}^{2} \\ = 90000 - 9 \\ = 89991$