If P(x)=ax^2+bx+c, Q(x)=-ax^2+dx+c where...

If `P(x)=ax^2+bx+c`, `Q(x)=-ax^2+dx+c` where `ac!=0` then `P(x).Q(x)=0` has

no real root

exactly two real roots

at least two real roots

none of these

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