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Mathematics

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Answer

(−∞,−2)∪(1,5)(-\infty, -2) \cup (1, 5)

Step-by-step solution

5 steps

To find the range of values for xx that satisfy the inequality x−2<6x−9x+2x-2 < \frac{6x-9}{x+2}, we will follow these steps:

  1. Move all terms to one side of the inequality to set it to zero.

    x−2<6x−9x+2x-2 < \frac{6x-9}{x+2} x−2−6x−9x+2<0x-2 - \frac{6x-9}{x+2} < 0
  2. Combine the terms into a single fraction by finding a common denominator.

    The common denominator is (x+2)(x+2).

    (x−2)(x+2)x+2−6x−9x+2<0\frac{(x-2)(x+2)}{x+2} - \frac{6x-9}{x+2} < 0

    Expand the numerator:

    x2−4−(6x−9)x+2<0\frac{x^2 - 4 - (6x-9)}{x+2} < 0

    Distribute the negative sign:

    x2−4−6x+9x+2<0\frac{x^2 - 4 - 6x + 9}{x+2} < 0

    Combine like terms in the numerator:

    x2−6x+5x+2<0\frac{x^2 - 6x + 5}{x+2} < 0
  3. Factor the quadratic expression in the numerator.

    The numerator x2−6x+5x^2 - 6x + 5 can be factored as (x−1)(x−5)(x-1)(x-5).

    (x−1)(x−5)x+2<0\frac{(x-1)(x-5)}{x+2} < 0
  4. Identify the critical points where the numerator or denominator is zero.

    These points divide the number line into intervals.

    • From the numerator: x−1=0  ⟹  x=1x-1=0 \implies x=1 and x−5=0  ⟹  x=5x-5=0 \implies x=5.
    • From the denominator: x+2=0  ⟹  x=−2x+2=0 \implies x=-2. The critical points are −2,1,5-2, 1, 5.
  5. Test a value from each interval created by the critical points to determine the sign of the expression (x−1)(x−5)x+2\frac{(x-1)(x-5)}{x+2}.

    • Interval 1: x<−2x < -2 (e.g., test x=−3x=-3)
    (−3−1)(−3−5)−3+2=(−4)(−8)−1=32−1=−32\frac{(-3-1)(-3-5)}{-3+2} = \frac{(-4)(-8)}{-1} = \frac{32}{-1} = -32

    Since −32<0-32 < 0, this interval (−∞,−2)(-\infty, -2) is part of the solution.

    • Interval 2: −2<x<1-2 < x < 1 (e.g., test x=0x=0)
    (0−1)(0−5)0+2=(−1)(−5)2=52\frac{(0-1)(0-5)}{0+2} = \frac{(-1)(-5)}{2} = \frac{5}{2}

    Since 52>0\frac{5}{2} > 0, this interval is not part of the solution.

    • Interval 3: 1<x<51 < x < 5 (e.g., test x=2x=2)
    (2−1)(2−5)2+2=(1)(−3)4=−34\frac{(2-1)(2-5)}{2+2} = \frac{(1)(-3)}{4} = \frac{-3}{4}

    Since −34<0\frac{-3}{4} < 0, this interval (1,5)(1, 5) is part of the solution.

    • Interval 4: x>5x > 5 (e.g., test x=6x=6)
    (6−1)(6−5)6+2=(5)(1)8=58\frac{(6-1)(6-5)}{6+2} = \frac{(5)(1)}{8} = \frac{5}{8}

    Since 58>0\frac{5}{8} > 0, this interval is not part of the solution.

    The inequality (x−1)(x−5)x+2<0\frac{(x-1)(x-5)}{x+2} < 0 is satisfied when the expression is negative.
    Combining the intervals where the expression is negative gives the solution.

    The range of values for xx is:

    (−∞,−2)∪(1,5)(-\infty, -2) \cup (1, 5)
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