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How do you factor $a^{2} - a - 20$ $a^2 - a - 20$ ?

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Jun 1, 2015

$a^{2} - a - 20 = a^{2} - 5 a + 4 a - 20$ $a^2-a-20=a^2-5a+4a-20$

$= a (a - 5) + 4 (a - 5)$ $=a(a-5)+4(a-5)$

$= (a - 5) (a + 4)$ $=(a-5)(a+4)$

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