Question

evaluate using identy (691)square​

Answer 1

= ( 690 + 1 ) 2

{ ( a+b ) 2 = A2 + b2 + 2ab }

= ( 690 ) 2 + (1) 2 + 2 x 690 x 1

Answer 2

✬ 477,481 ✬

Step-by-step explanation:

Given:

• (691)²

To Find:

• Whole square using identity

Solution: We can write 691 as (700 – 9)²

Using the formula :

$(x - y) ^{2} = x ^{2} + y ^{2} - 2xy$

Putting the value x = 700 and y = 9 in the formula we get

$(700) ^{2} + (9) ^{2} - 2 \times 700 \times 9$

$490000 + 81 - 12600$

$490081 - 12600$

$477481$

Hence, The square of (691)² = 477,481