Answer:
(x + 1) (3x - 1)
Step-by-step explanation:
Using the AC method, here a = 3, b = 2, and c = -1.
ac = 3 * -1 = -3
Factors of -3 that add up to +2 are +3 and -1.
Divide by a: +3/3, -1/3
Reduce: +1/1, -1/3
So the factors are x + 1 and 3x - 1.
3x² + 2x - 1 = (x + 1) (3x - 1)
