1) b² + 20b + 100 = (b + 10)²
2) y² - 14y + 49 = (y - 7)²
3) 81c² + 49y² - 126cy = 81c ² - 126cy + 49y² = (9c - 7y)²
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1) b² + 20b + 100 = (b + 10)²
2) y² - 14y + 49 = (y - 7)²
3) 81c² + 49y² - 126cy = 81c ² - 126cy + 49y² = (9c - 7y)²