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a) we are only concerned that the denominator not equal zero, therefore solve
x^2 + x - 6 = 0
(x+3)(x -2) = 0
x = -3, x = 2
Therefore the domain is (-infinity, -3)U(-3, 2)U(2, infinity)
b) here, inside the radical cannot be negative, therefore
9 - x^2 >_0
x^2 <_ 9
also, x - 1 >_0
Combining, both solutions yields domain
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