Question

How do you factorise 6x-9

Answer 1

6 x a number - 9 = factored

In this case, since the number is not declared as a specific number, this is the key to us factoring.

Like the number could be 6. ↓

Factoring:

`6*6-9=27\\6*3-9=9\\6*9-9=45`

bonus even factor:

`6*2-9=3`

These are factors and Least common multiples of 6 and 9.

Because 9 and 3 show up during half of the problem, and these are related to 6 and 9, the parents, we could measure this on a mathematical scale that this proves the factors correct.

There are other ways to factor this. See comments.