Answer:

1. (b+3) (b-3)

2. (2+y) (2-y)

3. (3a+4b) (3a+4b)

Step-by-step explanation:

1.

= b^2 - 9

= b^2 - 3^2

= (b+3) (b-3)

2.

= 4 - y^2

= 2^2 - y^2

= (2+y) (2-y)

3.

= 9a^2 - 16b^2

= (3a)^2 - (4b)^2

= (3a+4b) (3a+4b)

Verified answer

Answer:

1. (b+3) (b-3)

2. (y+2)(y-2)

3. (3a+4b)(3a-4b)

Step-by-step explanation: