The least common factor of any two integers is ' 1'.
In the case of 5 and 9, it's also their greatest common factor.
The LCF and the GCF are both 1.
The LCF of 315 and 1,000 is 5
The GCF of 5 and 75 is 5. The LCF of any set of integers is 1.
LCF? lowest common factor? Don't you mean highest common factor? The lcf usually has no meaning: it is 1
36
3
Their product.
5
5
80
It is 1
To factor any term, divide by the LCF (largest common factor) of the term. For 5x2-45, the LCF is 5. 5x2-45 = 5(x2-9) It can, of course, be factored even further to become: 5(x2-9) = 45(x2/9 - 1) but when factoring, we usually don't need to go past 5(x2-9) (for example, you've figured out that x2 = 9, thus x = +/- 3.)