the value p x(x-4)+p=0 has real roots,is
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px^2-4px+p=0
(-4p)^2-4p.p=0
16p^2-4p^2=0
12p^2=0
p=0
(-4p)^2-4p.p=0
16p^2-4p^2=0
12p^2=0
p=0
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