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Question

Determine the square value of 813 using direct multiplication method.

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Solution

We can write 8132=(800+13)2
Using (a+b)2=a(a+b)+b(a+b)
Here a=800,b=13
Therefore, 8132=800(800+13)+13(800+13)
=8002+10400+10400+132
=640000+20800+169
=660969

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