Using identities ,evaluate 71 square

Geobassurseuad5

Geobassurseuad5

Answered question

2023-02-18

Using identities ,evaluate 71 square

Answer & Explanation

Shiloh Hinton

Shiloh Hinton

Beginner2023-02-19Added 9 answers

We can write
71 as 70+1
So 71 2 = ( 70 + 1 ) 2
now we can use
( a + b ) 2 = a 2 + 2 a b + b 2
a=70
b=1
( 70 + 1 ) 2 = 70 2 + 2 × 1 × 70 + 1 2
= 4900 + 140 + 1
=5041

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