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The roots of $ax^2+bx+c=0$  are real and positive. $a$, $b$ and $c$ are real. Then $ax^2+b|x|+c=0$  has

  1. no roots
  2. $2$ real roots
  3. $3$ real roots
  4. $4$ real roots
in Differential Equations by (9.2k points)
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