P^2-4r=21

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Solution for P^2-4r=21 equation: 



^2-4P=21

We move all terms to the left:

^2-4P-(21)=0

determiningTheFunctionDomain
-4P-21+^2=0

We add all the numbers together, and all the variables

-4P=0

P=0/-4

P=0

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