I would suggest you to give each question separately. Just 6 points for 4 questions is too less to spend time.

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⇒ 15x² - 20x - 6x + 8

⇒ 5x(3x - 4) - 2 (3x - 4)

⇒ (3x - 4)(5x - 2)

2) p² + 16p - 16

There is an error in this.

It can be solved if it changed to p² + 15p - 16

⇒ p² + 16p - p - 16

⇒ p(p+16) - 1(p+16)

⇒ (p+16)(p-1)

3) 3x² - 4x - 4

⇒ 3x² - 6x + 2x - 4

⇒ 3x(x-2) + 2(x - 2)

⇒ (x - 2)(3x + 2)

4) x² - 5/12 x + 1/24

⇒x² - x/6 - x/4 + 1/24

⇒ x(x - 1/6) - 1/4(x - 1/6)

⇒ (x - 1/6)(x - 1/4)

15x² - 20x - 6x + 8

5x(3x - 4) - 2 (3x - 4)

(5x - 2) (3x - 4)