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a+b=11 ---------(1)
P(3)=a(3)+b=3a+b
3a+b=21 --------(2)
(1)
b=11-a
Reemplaza b en (2)
3a+(11-a)=21
2a=10
a=5
b=11-5= 6
b= 6
P(2)=2a+b=2(5)-6
P(2)=4
RaizP(2)=2