x^2-(5a+1)x+4a^2+a=0

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x^2-(5a+1)x+4a^2+a=0
x^2-(5a+1)x+4a^2+a=0

x^2-(5a+1)x+4a^2+a=0
x²-(5a+1)x+a(4a+1)=0
∴(x-a)[x-(4a+1)]=0
∴x=a x=4a+1

x^2-(5a+1)x+4a^2+a=0
(x-a)(x-(4a+1))=0
从而x=a或者x=4a+1

x²-(5a+1)x+4a²+a=0
x²-(5a+1)+a(4a+1)=0
(x-a)[x-(4a+1)]=0
x=a或x=4a+1