The polynomial 6x2 + 37x – 60 represents an integer. Which expressions represent integer factors of 6x2 + 37x – 60 for all values of x? 3x – 4 and 2x + 15 3x + 4 and 2x – 15 2x – 2 and 3x + 5 2x + 2 and 3x – 5