1.

If the equations x2 - px + q = 0 and x2 + qx - p = 0 have a common root, then which one of the following is correct?

A. p - q = 0
B. p + q - 2 = 0
C. p + q - 1 = 0
D. p - q - 1 = 0
Answer» E.


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