Question

evaluate using identy (691)square
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Answer 1

Answer:

477,481

Step-by-step explanation:

$(700 - 9) ^{2} = {(a - b)}^{2} \\ = > {(a - b)}^{2} = {a}^{2} + {b}^{2} - 2ab \\ = > {(700 - 9)}^{2} = {(700)}^{2} + {(9)}^{2} - 2 \times 700 \times 9 \\ = > {(700 - 9)}^{2} = 490000 + 81 - 12600 \\ = > {(700 - 9)}^{2} = 490081 - 12600 \\ = > {(700 - 9)}^{2} = 477,481 \\ = > {691}^{2} = 477,481$

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Answer 2

$(691)^{2} = (700 - 9) ^{2}$

Using identity =>

$(x - y) ^{2} = {x}^{2} + {y}^{2} - 2xy \\ (700) ^{2} + ( 9)^{2} - 2(700)( 9) \\ = 490000 + 81 - 12600 \\ = 477481$