2. –3m(m + 8)


–3m^2 + 24
–3m^2 – 24m
–24m^2
–4m + 5

4. (3x + 4)(x – 2)

3x^2 – 2x – 8
x – 8
3x – 2x – 8
3x^2 + 2x + 8

5. (2y – 1)(4y – 3)

–2y + 3
8y^2 – 10y – 3
8y^2 – 10y + 3
8y^2 – 2y + 3

My answers:
2. –3m^2 – 24m
4. (3x + 4)(x – 2) = 3x^2 – 2x – 8
5. 8y^2 – 2y + 3

All are right.