Factor completely using the trial-and-error

Question

1. Factor completely.

x² –7x –60

2. Factor completely.

20y² + 7y – 6

3. Factor completely.

7x² + 7x – 14

4. Factor completely using the trial-and-error method.

–6x² + 5x + 4

5. Factor completely using the trial-and-error method.

6x² –21x –27

6. Factor completely using the trial-and-error method.

6c³ + 18c² -  60c

7. Factor completely using the trial-and-error method.

6x² + 6x – 12