square of 71 using identity
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Answered by
1
Answer:
5041
Step-by-step explanation:
{71}²
=(70+1) ² [(a+b)² =a²+b²+2ab
putting a=70&b=1]
=(70)² + (1)² = 2(70) (1)
=4900+1+140
=5041
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