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Tju [1.3M]
1 year ago
14

Which inequality represents all values of x for which the quotient below is

Mathematics
1 answer:
Vika [28.1K]1 year ago
4 0

Answer: -2 \le x < 5

========================================================

Explanation:

We cannot have negative numbers under the square root, if we wanted the result to be some real number.

The stuff under the square root must be 0 or larger.

This means the x+2 must be 0 or larger.

x+2 \ge 0\\\\x \ge -2

Similarly, the 5-x must be 0 or larger. But wait, we cannot have 0 in the denominator (or else we have a division by zero error), so 5-x must be larger than 0.

5-x > 0

5-x+x > 0+x

5+0 > 0+x

5 > x

x < 5

Combine both x \ge -2 and x < 5 to find the domain is -2 \le x < 5

--------------------------------------------------------

Visual confirmation is shown below. I used Desmos which is a free graphing app.

  • f(x) = sqrt(x+2) is in red
  • g(x) = sqrt(5-x) is in blue
  • h(x) = f(x)/g(x) is in green

The green curve is what we're after. It's between x = -2 and x = 5

We include -2, but exclude 5.

Take note of the closed endpoint at x = -2, and also the vertical asymptote at x = 5. The curve approaches this asymptote but never actually touches it. Think of an electric fence you can get closer to, but not actually touch.

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\huge \huge \huge\huge\mathrm{ \boxed{ \boxed{ \boxed{ \boxed{ \boxed {\boxed{  \huge\mathfrak{ Solution}}}}}}}}

  • \sqrt{x - 1}   - x =  - 7

  • \sqrt{x - 1}  =x  - 7

  • x - 1 = (x - 7) {}^{2}

  • x - 1 =  {x}^{2}  + 49 - 14x

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