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=> (x + 4)² = x² + 8x + 16.
20.) (3x - ...)² = ... - ... + 25
=> (3x - 5)² = 9x² - 30x + 25.
21.) (y + ...)² = ... + 2y + ...
=> (y + 1)² = y² + 2y + 1.
22.) (3y + ...)² = ... + 24y + ...
=> (3y + 4)² = 9y² + 24y + 16