Iwant to know how to do this question

Your answer is 6(x + 20).

To factor expressions, we first must find the highest common factor in both 6x and 120 that we can take out. This is because you could factor out 2, but that would leave us with 2(3x + 60), which can be factored again and is therefore not fully factored.

The highest common factor of 6x and 120 is 6, so we simply divide both terms by 6 and place them in the brackets, while leaving the 6 outside of the brackets, which gives us 6(x + 20).

I hope this helps!