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The given function is h(x) = (6)/(x-2) - 1.

Computer Science

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3 parts
6.1

x=2x=2

y=−1y=-1

6.2
(8, 0)
(0, -4)
6.4

x∈[0,2)∪(8,∞)x \in [0, 2) \cup (8, \infty)

Graph of h(x) = 6/(x − 2) − 1

Use the left and right arrow keys to trace the curve, up and down to jump between key points, and plus and minus to zoom.

Key points of h(x) = 6/(x − 2) − 1
Pointxy
y-intercept0−4
x-intercept80

Step-by-step solution

9 steps

Part 6.1· 2 steps

The given function is h(x)=6x−2−1h(x) = \frac{6}{x-2} - 1.
For a rational function of the form y=ax−p+qy = \frac{a}{x-p} + q:
The vertical asymptote is x=px=p.
The horizontal asymptote is y=qy=q.

  1. Identify the vertical asymptote.

    The denominator cannot be zero, so x−2≠0x-2 \neq 0.

    x−2=0x-2 = 0 x=2x = 2

    The vertical asymptote is x=2x=2.

  2. Identify the horizontal asymptote.

    The constant term is −1-1.
    The horizontal asymptote is y=−1y=-1.

    The equations of the asymptotes are:
    Vertical asymptote: x=2\boxed{x=2}
    Horizontal asymptote: y=−1\boxed{y=-1}

Part 6.2(8, 0)

  1. Determine the x-intercept.

    Set h(x)=0h(x) = 0:

    6x−2−1=0\frac{6}{x-2} - 1 = 0 6x−2=1\frac{6}{x-2} = 1 6=x−26 = x-2 x=8x = 8

    The x-intercept is (8,0)\boxed{(8, 0)}.

  2. Determine the y-intercept.

    Set x=0x = 0:

    h(0)=60−2−1h(0) = \frac{6}{0-2} - 1 h(0)=6−2−1h(0) = \frac{6}{-2} - 1 h(0)=−3−1h(0) = -3 - 1 h(0)=−4h(0) = -4

    The y-intercept is (0,−4)\boxed{(0, -4)}.

Part 6.3

To sketch the graph of h(x)=6x−2−1h(x) = \frac{6}{x-2} - 1:

  • Draw the vertical asymptote at x=2x=2 as a dashed line.
  • Draw the horizontal asymptote at y=−1y=-1 as a dashed line.
  • Plot the x-intercept at (8,0)(8, 0).
  • Plot the y-intercept at (0,−4)(0, -4).
  • Since the numerator 6 is positive, the graph will have branches in the top-right and bottom-left sections relative to the asymptotes.
  • Draw the branch that passes through (0,−4)(0, -4), approaching x=2x=2 from the left and y=−1y=-1 from below.
  • Draw the branch that passes through (8,0)(8, 0), approaching x=2x=2 from the right and y=−1y=-1 from above.

Part 6.4

x∈[0,2)∪(8,∞)x \in [0, 2) \cup (8, \infty)

Determine the values of xx for which h(x)<0h(x) < 0 for x∈[0;∞)x \in [0; \infty).

  1. Set up the inequality.

    6x−2−1<0\frac{6}{x-2} - 1 < 0
  2. Combine terms to a single fraction.

    6−(x−2)x−2<0\frac{6 - (x-2)}{x-2} < 0 6−x+2x−2<0\frac{6 - x + 2}{x-2} < 0 8−xx−2<0\frac{8 - x}{x-2} < 0
  3. Find the critical points.

    The numerator is zero when 8−x=0  ⟹  x=88-x=0 \implies x=8.
    The denominator is zero when x−2=0  ⟹  x=2x-2=0 \implies x=2.
    These points divide the number line into intervals: (−∞,2)(-\infty, 2), (2,8)(2, 8), (8,∞)(8, \infty).

  4. Test each interval.

    • For x<2x < 2 (e.g., x=0x=0): 8−00−2=8−2=−4\frac{8-0}{0-2} = \frac{8}{-2} = -4. Since −4<0-4 < 0, the inequality holds for x<2x < 2.
    • For 2<x<82 < x < 8 (e.g., x=3x=3): 8−33−2=51=5\frac{8-3}{3-2} = \frac{5}{1} = 5. Since 5>05 > 0, the inequality does not hold for 2<x<82 < x < 8.
    • For x>8x > 8 (e.g., x=9x=9): 8−99−2=−17\frac{8-9}{9-2} = \frac{-1}{7}. Since −17<0\frac{-1}{7} < 0, the inequality holds for x>8x > 8.

    So, h(x)<0h(x) < 0 when x<2x < 2 or x>8x > 8.

  5. Consider the given domain x∈[0;∞)x \in [0; \infty).

    We need to find the intersection of (−∞,2)∪(8,∞)(-\infty, 2) \cup (8, \infty) with [0,∞)[0, \infty).

    • For x<2x < 2: The part within [0,∞)[0, \infty) is [0,2)[0, 2).
    • For x>8x > 8: The part within [0,∞)[0, \infty) is (8,∞)(8, \infty).

    The values of xx for which h(x)<0h(x) < 0 for x∈[0;∞)x \in [0; \infty) are x∈[0,2)∪(8,∞)\boxed{x \in [0, 2) \cup (8, \infty)}.

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