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OpenStudy (anonymous):
PLEASE HELP WILL GIVE A MEDAL Please help and explain all steps! Factor completely: a^2 - a - 20
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OpenStudy (anonymous):
The 9th space has the number 4!
OpenStudy (p0sitr0n):
a^2-a-20=a^2-5a+4a+(-5)(4)=a(a+4)-5(a+4)=(a-5)(a+4)
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