If there are two unique solutions to the equation $x^2 + bx + 9 = 0,$ which of the following could not be a value of

If there are two unique solutions to the equation $x^2 + bx + 9 = 0,$ which of the following could not be a value of $b?$

A. -10
B. -6.5
C. -6
D. 6.5
E. 10

Answer: C

Source: Veritas Prep

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