using the formula (a-b)^2=(a^2-2ab+b^2) do question (689)^2
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Step-by-step explanation:
using the formula (a-b)^2=(a^2-2ab+b^2)
689²=(700-11)²
=700²+11²-(2×700×11)
=490000+121-15400
=4,74,721
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