rileywilliamsuk rileywilliamsuk

07-07-2017
Mathematics

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Completely Factor: a 2 - a - 20

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konrad509 konrad509

07-07-2017

[tex]a^2 - a - 20=\\ a^2-5a+4a-20=\\ a(a-5)+4(a-5)=\\ (a+4)(a-5)[/tex]

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20 is what i need help with