185 X 185 - 115 × 115
Anonymous:
using identities
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we know that , a^2 - b^2 = (a+b)(a-b)
now we have , (185)^2 - (115)^2 = (185+115)(185-115)
= 300 × 70 = 21000
now we have , (185)^2 - (115)^2 = (185+115)(185-115)
= 300 × 70 = 21000
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