expand:
$9 (x - y)^{2} + 6 (y - x)$

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Solution

$9 (x - y)^{2} + 6 (y - x) = 9 (x - y)^{2} - 6 (x - y)$
$= 3 (x - y) 3 (x - y) - 2$

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expand:9(x−y)2+6(y−x)

9(x−y)2+6(y−x)=9(x−y)2−6(x−y)=3(x−y)3(x−y)−2

expand:
$9 (x - y)^{2} + 6 (y - x)$

$9 (x - y)^{2} + 6 (y - x) = 9 (x - y)^{2} - 6 (x - y)$
$= 3 (x - y) 3 (x - y) - 2$