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Sketching the Graph of a Rational Function.

(a) state the domain of the function,
(b) identify all intercepts,
(c) find any vertical or
horizontal asymptotes
(d) plot additional solution points as needed to sketch the graph of the rational
function.

1. f(x) = 1/ x-3

2. f(x) = x²/x² + 9

3. f(t) = 1 - 2t/ x² - 3x - 4

4. g(s) = 4S/S² + 4

5. f(x) = - x/ (x - 2)²

6. h(x) = 2x/ x² - 3x - 4

User Makromat
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1 Answer

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1. f(x) = 1/(x - 3):

Domain: All real numbers except x = 3.

Intercepts: None.

Asymptotes: Vertical asymptote at x = 3.

Additional Points: Choose x-values on both sides of 3, e.g., x = 2, 4.

2. f(x) = x²/(x² + 9):

Domain: All real numbers.

Intercepts: Y-intercept at (0, 0).

Asymptotes: None.

Additional Points: Choose x-values and find corresponding y-values.

3. f(t) = (1 - 2t)/(t² - 3t - 4):

Domain: All real numbers except t = -1, 4.

Intercepts: Y-intercept at (0, 1).

Asymptotes: None.

Additional Points: Choose x-values and find corresponding y-values.

4. g(s) = 4s/(s² + 4):

Domain: All real numbers.

Intercepts: Y-intercept at (0, 0).

Asymptotes: None.

Additional Points: Choose x-values and find corresponding y-values.

5. f(x) = -x/(x - 2)²:

Domain: All real numbers except x = 2.

Intercepts: X-intercept at (0, 0).

Asymptotes: Vertical asymptote at x = 2.

Additional Points: Choose x-values on both sides of 2.

6. h(x) = 2x/(x² - 3x - 4):

Domain: All real numbers except x = -1, 4.

Intercepts: Y-intercept at (0, 0).

Asymptotes: None.

Additional Points: Choose x-values and find corresponding y-values.

1. f(x) = 1/(x - 3):

Domain: The domain is all real numbers except the value that makes the denominator zero. In this case, the denominator is (x - 3), so x ≠ 3.

Intercepts: There are no intercepts in this case as the numerator is always 1.

Asymptotes: There is a vertical asymptote at x = 3 since division by zero occurs at this point.

2. f(x) = x²/(x² + 9):

Domain: There are no restrictions on the domain since there are no denominators.

Intercepts: The y-intercept is found by setting x = 0, giving (0, 0).

Asymptotes: Since there are no denominators, there are no vertical or horizontal asymptotes.

3. f(t) = (1 - 2t)/(t² - 3t - 4):

Domain: Exclude values making the denominator zero. Factor the denominator: (t - 4)(t + 1). Set each factor equal to zero to find t ≠ -1, 4.

Intercepts: The y-intercept is found by setting t = 0, giving (0, 1).

Asymptotes: There are no vertical or horizontal asymptotes.

4. g(s) = 4s/(s² + 4):

Domain: No restrictions on the domain.

Intercepts: The y-intercept is found by setting s = 0, giving (0, 0).

Asymptotes: No asymptotes since the degree of the numerator is the same as the degree of the denominator.

5. f(x) = -x/(x - 2)²:

Domain: Exclude x = 2, as it makes the denominator zero.

Intercepts: The x-intercept is found by setting y = 0 and solving for x.

Asymptotes: Vertical asymptote at x = 2 due to division by zero.

6. h(x) = 2x/(x² - 3x - 4):

Domain: Exclude x = -1, 4, as they make the denominator zero.

Intercepts: The y-intercept is found by setting x = 0, giving (0, 0).

Asymptotes: No asymptotes.

Sketching the Graph of a Rational Function. (a) state the domain of the function, (b-example-1
User JMRC
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