If the equations x^2+p x+q=0 and x^2+p^(...

If the equations `x^2+p x+q=0 and x^2+p^(prime)x+q^(prime)=0` have a common root, then it must be equal to a.`(p^(prime)-p ^(prime) q)/(q-q^(prime))` b. `(q-q ')/(p^(prime)-p)` c. `(p^(prime)-p)/(q-q^(prime))` d. `(p q^(prime)-p^(prime) q)/(p-p^(prime))`

`(p-p')/(q-q')`

`(p+p')/(q+q')`

`(q'-q)/(p-p')`

`(q+q')/(p+p')`

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