Question

using identities find the value of
$(39) {}^{2}$
​

Answer 1

$(39) {}^{2}$

$1521$

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Answer 2

ANSWER :

${39}^{2} = {(40 - 1)}^{2} \\ = {40 }^{2} - 2(40)(1) + {1}^{2} \\ = 1600 - 80 + 1 \\ = 1521$

FINAL ANSWER :

1521

NOTE :

FORMULA :

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