If one root of the two quadratic equations x^2 + ax + b = 0 and x^2 + bx + a = 0 is common, then
If one root of the two quadratic equations x2 + ax + b = 0 and x2 + bx + a = 0 is common, then
A) a + b = -1
B) ab = -1
C) ab = 1
D) a + b = 1
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