The difference of squares (integers) — task. Mathematics CBSE, Class 7.

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Factor the following expression:

{(x + 21 y)}^{2} - {(21 x + y)}^{2}

Choose the correct answer:

$440 (x^{2} - y^{2})$
none of these expressions
$-440 x^{2} + 440 y^{2}$
$(x^{2} + {441 y}^{2}) \cdot ({441 x}^{2} + y^{2})$
$(x^{2} + 42 x y + {441 y}^{2}) - ({441 x}^{2} + {42 x y + y}^{2})$
$(-20 x + 20 y) \cdot (22 x + 22 y)$

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