Question

using the foumula
$(a - b) {}^{2} = a {}^{2} - 2ab + b {}^{2}$
evaluate:-
$(689) {}^{2}$
​

Answer 1

Answer:

488732

Step-by-step explanation:

(689)^2=(700-11)^2

therefore,

700^2-2(700)(11)+11^2

490000-1389+121

488732

Answer 2

QUESTION :

using the foumula

$(a - b) {}^{2} = a {}^{2} - 2ab + b {}^{2}$

evaluate:-

$(689) {}^{2}$

ANSWER :

474721

step by step explanation :

${689}^{2} \\ = {(700 - 11)}^{2} \\ = {(700)}^{2} -( 2 \times 700 \times 11) + {(11)}^{2} \\ = 490000 - 15400 \: + 121 \\ = 474721$

I hope it will helps you!

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