1.

If the roots of the equation a (b – c) x2 + b (c – a) x + c (a – b) = 0 are equal, then which one of the following is correct?

A. 2b = a + c
B. b2 = ac
C. 2/b = 1/a + 1/c
D. 1/b = 1/a + 1/c
Answer» D. 1/b = 1/a + 1/c


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