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If the equation x^2=a x+b=0 has distinct...

If the equation `x^2=a x+b=0` has distinct real roots and `x^2+a|x|+b=0` has only one real root, then which of the following is true? `b=0, a >0` b. `b=0, a<0` c. `b >0, a<0` d. `b<<0, a>>0`

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