Question

using identities evaluate the following 81^2​

Answer 1

✔ 81^2 = (80 + 1)^2

using (a + b)^2 = a^2 + b^2 + 2ab

✔ (80 + 1)^2
➡ (80)^2 + (1)^2 + 2(80)(1)
➡ 6400 + 1 + 160
➡ 6561

Answer 2

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