Question

$1 { }^{2} + 2 {}^{2} + 2 {}^{2} = 3 {}^{2}$
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Answer 1

Step-by-step explanation:

1+4+4=9

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Answer 2

$1^2 + 2^2 + 2^2$

$1 + 4 + 4 = 9$

and , $3^2 = 9$

so ,  $1^2 + 2^2 + 2^2$ $= 3^2$