B.
1. (x² + 3xy + 9y²)
2. (a + 2)
3. (2x - 3)
4. (m - 9)
5. (2x + 5)
6. (2x - 5y)²
C.
1. 2x(3x + 2)²
2. (x + 2y) (x - 2y)
D.
1. (x + 6) (x - 3)
2. (5x + 7)²
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Answers & Comments
B.
1. (x² + 3xy + 9y²)
2. (a + 2)
3. (2x - 3)
4. (m - 9)
5. (2x + 5)
6. (2x - 5y)²
C.
1. 2x(3x + 2)²
2. (x + 2y) (x - 2y)
D.
1. (x + 6) (x - 3)
2. (5x + 7)²