It is x^2 -4 = (x-2)(x+2) when factored and it is the difference of two squares
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(x+8)(x-5)
An expression that completely divides a given polynomial without leaving a remainder is called a factor of the polynomial. This means that when the polynomial is divided by the factor, the result is another polynomial with no remainder. Factors of a polynomial can be found by using methods such as long division, synthetic division, or factoring techniques like grouping, GCF (greatest common factor), or special patterns.
(x + 8)(x - 5)
(5x - 1)(x + 6)
Start by looking for a common factor. Separate this factor, then factor the remaining polynomial.