Q4 of 50 Page 6

Find square of 86.

We can write 86 as (80 + 6)


To Find: (86)2


Therefore,


(86)2 = (80 + 6)2


[Applying the formula: (a + b)2 = a2 + b2 + 2ab]


We get,


(86)2 = (80)2 + (6)2 + 2.80.6


= 6400 + 36 + 960


= 7396


Hence, (86)2 = 7396.


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