TabbyKun00 TabbyKun00

29-03-2018
Mathematics

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solve by factoring p^2-4p=21

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Bladerunner1976 Bladerunner1976

29-03-2018

[tex]p^2-4p=21 \\ p^2 - 4p-21 = 0[/tex] - set the equation equal to 0
[tex](p + 3)(p-7) = 0[/tex] - factor
[tex]p +3=0 \\ p=-3[/tex] - one answer
[tex]p-7 = 0 \\ p=7[/tex] - Second answer

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