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OpenStudy (anonymous):
Factor completely a 2 - a - 20
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OpenStudy (anonymous):
\[a^2 -a - 20=> a ^2 -5a + 4a - 20 => a(a -5) + 4(a-5)=>(a+)(a-5)\]
OpenStudy (anonymous):
typo there: (a+4)a(-5)
OpenStudy (mathmath333):
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