Math books and teachers will make it look like all trinomials can be factored, but many are not.
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The question does not contain an expression that can be factorised.
(n + 4) and (n - 5) are factors of n^2 - n - 20 They cannot be factored further.
Too bad that's not a^2 - ab - 42b^2 That factors to (a + 6b)(a - 7b)
6 feet = 6x12 = 72 inches, so the total is 72+7 = 79. 79 is a prime number; it cannot be factored.
This polynomial is irreducible; it cannot be factored.