Question

5. Evaluate using identities: 99^2

Answer 1

Step-by-step explanation:

$(100 - 1) {}^{2} \\ (a - b) {}^{2} = a {}^{2} + b {}^{2} - 2ab \\ (100) {}^{2} + (1) {}^{2} - 2(100)(1) \\ 10000 + 1 - 200 \\ 10001 - 200 \\ 9801$

Answer 2

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