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OpenStudy (goformit100):
How can we solve 1397 x 1397 = ? A. 1951609 B. 1981709 C. 18362619 D. 2031719 E. None of these mentally ?
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OpenStudy (goformit100):
@91004775
OpenStudy (goformit100):
@Shannon20150
OpenStudy (anonymous):
1st two options
OpenStudy (anonymous):
Its A
OpenStudy (anonymous):
(1300 + 97)^2 = 1300^2 + 97^2 + 2*1300*97
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OpenStudy (agent0smith):
@kamalkayani that's a good method... but it doesn't really help solve it mentally (i'm guessing it means how to do it in your head with no paper)
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