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Multiple choice

Let $P(x)=x^3+3ax^2+3bx+c$ and $P(x)=0$ only for $x=\alpha$ then; $\alpha$ is also root of equation

  1. $x^2+2bx+a=0$
  2. $ax^2+2bx+a=0$
  3. $x^2+bx+c=0$
  4. $x^2+bx+1=0$
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