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Mathematics 15 Online
OpenStudy (anonymous):

Factor the trinomial completely? a^2 – 5a – 20

jimthompson5910 (jim_thompson5910):

find two numbers that multiply to -20 and add to -5

jimthompson5910 (jim_thompson5910):

call these numbers m and n once you find the two numbers, a^2 – 5a – 20 would factor to (a+m)(a+n)

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