(2m + 3n – p)² + (2m – 3n + p)² – 2(2m + 3n – p)(2m – 3n + p)সরল কর

(2a + 7)² + 2(2a + 7) (2a – 7) + (2a – 7)² সরল কর, (3x + 2y)² + 2(3x + 2y) (3x – 2y) + (3x – 2y)² সরল কর, (7p + 3r – 5x)² – 2 (7p + 3r – 5x) (8p – 4r – 5x) + (8p – 4r – 5x)² সরল কর