What is the value of the rational expression the fraction with numerator x and denominator x squared minus 9 when x is equal to negative 3 ?

Substitute x = -3 into the denominator: x² - 9 = (-3)² - 9 = 9 - 9 = 0. Since the denominator is zero, the fraction is undefined; the numerator being -3 does not change that.

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