Question

84^2 solve by identity​

Answer 1

Answer:

7056

Step-by-step explanation:

Answer 2

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solve by identity

${(84)}^{2}$

$\huge {\boxed {\mathbb {ANSWER}}}$

$\implies {(84)}^{2}$

$\implies {(80+4)}^{2}$

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

$a=80\\b=4$

$Substitute\: the \:values$

$\implies{(80+4)}^{2}={(80)}^{2}+2(80)(4)+{(4)}^{2}$

$\implies 6400+640+16$

$\implies {\boxed {\boxed {7056}}}$

$\huge {\boxed {\mathbb {HOPE \:IT \:HELPS \:YOU}}}$

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$Identities$

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

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

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

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