Fill in each blank in column A to make each expression a perfect square trinomial. Then, match each completed perfect square trinomial with its factors in column B.

Answer:
1. x² + 6x + 9 • • (x + 3)²
2. 4x² - 20xy + 25y² • • (2x - 5y)²
3. 16x² + 56xy + 49y² • • (4x + 7y)²
4. x² - 16x + 64 • • (x - 8)²
5. 36x⁴ + 60x²y + 25y² • • (6x² + 5y)²