In Exercises 1-2, (a) Find the interval(s) for b such that the equation has at least one

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In Exercises 1-2, 

(a) Find the interval(s) for b such that the equation has at least one real solution and  

(b) Write a conjecture about the interval(s) based on the values of the coefficients.

1. x2 + bx + 9 = 0

2. x2 + bx - 9 = 0

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