Let's group them The 3ax + 6a Group Bring out which numbers or letters are common in both expressions You can see 3 can go into 6, hence 3 is common a also appeared at both sides, hence a is also common 3a(x+2)
The - x - 2 Group −x=−1×x −2=−1×2 Hence −x−2=−1×x−1×2 - 1 is common −1×x−1×2=−1(x+2) 3ax+6a−x−2=3a(x+2)−1(x+2) 3a(x+2)−1(x+2) (x+2) is also common, hence bring it out (x+2)(3a−1) (x+2)(3a−1) is the same as (3a−1)(x+2), you can change the order of multiplication and the result will still be the same