Question

please give me full explanation...

$1. \: (x - 2y + 3) {}^{2} + (x + 2y - 3) {}^{2}$
$2. \: (3k - 4r - 2m) {}^{2} - (3k + 4r - 2m)$
$3. \: (7a - 6b + 5c) {}^{2} + (7a + 6b - 5c) {}^{2}$
please give me a answer
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Answer 1

Answer:

Step-by-step explanation:

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