No.
a2 - 4 can indeed be factored. It's what we call a difference of squares. This is a special case when one perfect square is subtracted from another one. Any binomial in the format a2 - b2 can be factored out as (a + b)(a - b). In this case then, it would be: (a + 2)(a - 2)
Well x squared could can be broken down (factored) into x times x. So yes, it can be.
It is (x-1)(x-8) when factored
No it is not, however, 6x² - 5xy is.
(a - 2b)(2a - b)
It is: (c-4)(c-8) when factored
6y2+17y-14 = (2x+7)(3x-2) when factored
v2+36v+99 = (v+3)(v+33) when factored
a2 - 4 can indeed be factored. It's what we call a difference of squares. This is a special case when one perfect square is subtracted from another one. Any binomial in the format a2 - b2 can be factored out as (a + b)(a - b). In this case then, it would be: (a + 2)(a - 2)
Well x squared could can be broken down (factored) into x times x. So yes, it can be.
It is (x-1)(x-8) when factored
...
No it is not, however, 6x² - 5xy is.
(a - 2b)(2a - b)
It is a quadratic expression which can be factored in two different ways depending if it's -11w or +11w
2x2-1x-120 = (2x+15)(x-8) when factored
64-x2 = (8-x)(8+x) when factored