How do you factor $x²-x-20$ ?

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Answer 1 · 2016-04-16T19:00:08

$x^2-x-20 = (x-5)(x+4)$

Find a pair of factors of $20$ that differ by $1$ . The pair $5, 4$ works, so we find:

$x^2-x-20 = (x-5)(x+4)$

How do you factor x²-x-20x²-x-20?