Question

using second identity solve (55)^2​

Answer 1

Answer:

3025

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Answer 2

$(55)^2=(50+5)^2\\=(50)^2+(5)^2+2.50.5\\=2500+25+500\\=3025$

$(55)^2=(60-5)^2\\=(60)^2+(5)^2-2.60.5\\=3600+25-600\\=3025$