Question

5.find the value of 71²

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Answer 1

Answer:

71^2

=71×71

=5041...Ans.....

Answer 2

Answer:

Using identities, evaluate

${71}^{2}$

=(70+1)^2

(a+b)^2=a^2+b^2+2ab

Putting a=70 & b=1

-(70)^2 + 1 (1)^2 + 2(70)(1)

=4900 + 1 + 140

=5041