Using the properties of combinations of continuous functions, determine the interval(s) over which the function f left parenthesis x right parenthesis equals fraction numerator x squared minus 3 x minus 18 over denominator x plus 2 end fraction is continuous.A. left parenthesis short dash infinity comma space infinity right parenthesisB. left parenthesis short dash infinity comma space short dash 2 right parenthesis union left parenthesis short dash 2 comma space infinity right parenthesisC. left parenthesis short dash infinity comma space short dash 3 right parenthesis union left parenthesis short dash 3 comma short dash 2 right parenthesis union left parenthesis short dash 2 comma space 6 right parenthesis union left parenthesis 6 comma space infinity right parenthesisD. left parenthesis short dash 2 comma space 2 right parenthesis
Question
Using the properties of combinations of continuous functions, determine the interval(s) over which the function f left parenthesis x right parenthesis equals fraction numerator x squared minus 3 x minus 18 over denominator x plus 2 end fraction is continuous.A. left parenthesis short dash infinity comma space infinity right parenthesisB. left parenthesis short dash infinity comma space short dash 2 right parenthesis union left parenthesis short dash 2 comma space infinity right parenthesisC. left parenthesis short dash infinity comma space short dash 3 right parenthesis union left parenthesis short dash 3 comma short dash 2 right parenthesis union left parenthesis short dash 2 comma space 6 right parenthesis union left parenthesis 6 comma space infinity right parenthesisD. left parenthesis short dash 2 comma space 2 right parenthesis
Solution
The function f(x) = (x^2 - 3x - 18) / (x + 2) is a rational function. A rational function is continuous everywhere except where the denominator is zero.
To find where the denominator is zero, we set x + 2 = 0 and solve for x. This gives us x = -2.
Therefore, the function is continuous for all real numbers except x = -2.
So, the intervals of continuity for the function are (-∞, -2) and (-2, ∞).
So, the correct answer is B. (-∞, -2) U (-2, ∞).
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