Mister Exam
Graphing y = y=1/|x|-4
The solution
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f(x) = --- - 4
|x|
$$f{\left(x \right)} = -4 + \frac{1}{\left|{x}\right|}$$
f = -4 + 1/|x|
The graph of the function
The domain of the function
The points at which the function is not precisely defined:
$$x_{1} = 0$$
$$x_{1} = 0$$
The points of intersection with the X-axis coordinate
Graph of the function intersects the axis X at f = 0
so we need to solve the equation:
$$-4 + \frac{1}{\left|{x}\right|} = 0$$
Solve this equation
The points of intersection with the axis X:
Analytical solution
$$x_{1} = - \frac{1}{4}$$
$$x_{2} = \frac{1}{4}$$
Numerical solution
$$x_{1} = -0.25$$
$$x_{2} = 0.25$$
so we need to solve the equation:
$$-4 + \frac{1}{\left|{x}\right|} = 0$$
Solve this equation
The points of intersection with the axis X:
Analytical solution
$$x_{1} = - \frac{1}{4}$$
$$x_{2} = \frac{1}{4}$$
Numerical solution
$$x_{1} = -0.25$$
$$x_{2} = 0.25$$
Extrema of the function
In order to find the extrema, we need to solve the equation
$$\frac{d}{d x} f{\left(x \right)} = 0$$
(the derivative equals zero),
and the roots of this equation are the extrema of this function:
$$\frac{d}{d x} f{\left(x \right)} = $$
the first derivative
$$- \frac{\operatorname{sign}{\left(x \right)}}{x^{2}} = 0$$
Solve this equation
Solutions are not found,
function may have no extrema
$$\frac{d}{d x} f{\left(x \right)} = 0$$
(the derivative equals zero),
and the roots of this equation are the extrema of this function:
$$\frac{d}{d x} f{\left(x \right)} = $$
the first derivative
$$- \frac{\operatorname{sign}{\left(x \right)}}{x^{2}} = 0$$
Solve this equation
Solutions are not found,
function may have no extrema
Inflection points
Let's find the inflection points, we'll need to solve the equation for this
$$\frac{d^{2}}{d x^{2}} f{\left(x \right)} = 0$$
(the second derivative equals zero),
the roots of this equation will be the inflection points for the specified function graph:
$$\frac{d^{2}}{d x^{2}} f{\left(x \right)} = $$
the second derivative
$$\frac{2 \left(- \delta\left(x\right) + \frac{\operatorname{sign}{\left(x \right)}}{x}\right)}{x^{2}} = 0$$
Solve this equation
Solutions are not found,
maybe, the function has no inflections
$$\frac{d^{2}}{d x^{2}} f{\left(x \right)} = 0$$
(the second derivative equals zero),
the roots of this equation will be the inflection points for the specified function graph:
$$\frac{d^{2}}{d x^{2}} f{\left(x \right)} = $$
the second derivative
$$\frac{2 \left(- \delta\left(x\right) + \frac{\operatorname{sign}{\left(x \right)}}{x}\right)}{x^{2}} = 0$$
Solve this equation
Solutions are not found,
maybe, the function has no inflections
Vertical asymptotes
Have:
$$x_{1} = 0$$
$$x_{1} = 0$$
Horizontal asymptotes
Let’s find horizontal asymptotes with help of the limits of this function at x->+oo and x->-oo
$$\lim_{x \to -\infty}\left(-4 + \frac{1}{\left|{x}\right|}\right) = -4$$
Let's take the limit
so,
equation of the horizontal asymptote on the left:
$$y = -4$$
$$\lim_{x \to \infty}\left(-4 + \frac{1}{\left|{x}\right|}\right) = -4$$
Let's take the limit
so,
equation of the horizontal asymptote on the right:
$$y = -4$$
$$\lim_{x \to -\infty}\left(-4 + \frac{1}{\left|{x}\right|}\right) = -4$$
Let's take the limit
so,
equation of the horizontal asymptote on the left:
$$y = -4$$
$$\lim_{x \to \infty}\left(-4 + \frac{1}{\left|{x}\right|}\right) = -4$$
Let's take the limit
so,
equation of the horizontal asymptote on the right:
$$y = -4$$
Inclined asymptotes
Inclined asymptote can be found by calculating the limit of 1/|x| - 4, divided by x at x->+oo and x ->-oo
$$\lim_{x \to -\infty}\left(\frac{-4 + \frac{1}{\left|{x}\right|}}{x}\right) = 0$$
Let's take the limit
so,
inclined coincides with the horizontal asymptote on the right
$$\lim_{x \to \infty}\left(\frac{-4 + \frac{1}{\left|{x}\right|}}{x}\right) = 0$$
Let's take the limit
so,
inclined coincides with the horizontal asymptote on the left
$$\lim_{x \to -\infty}\left(\frac{-4 + \frac{1}{\left|{x}\right|}}{x}\right) = 0$$
Let's take the limit
so,
inclined coincides with the horizontal asymptote on the right
$$\lim_{x \to \infty}\left(\frac{-4 + \frac{1}{\left|{x}\right|}}{x}\right) = 0$$
Let's take the limit
so,
inclined coincides with the horizontal asymptote on the left
Even and odd functions
Let's check, whether the function even or odd by using relations f = f(-x) и f = -f(-x).
So, check:
$$-4 + \frac{1}{\left|{x}\right|} = -4 + \frac{1}{\left|{x}\right|}$$
- Yes
$$-4 + \frac{1}{\left|{x}\right|} = 4 - \frac{1}{\left|{x}\right|}$$
- No
so, the function
is
even
So, check:
$$-4 + \frac{1}{\left|{x}\right|} = -4 + \frac{1}{\left|{x}\right|}$$
- Yes
$$-4 + \frac{1}{\left|{x}\right|} = 4 - \frac{1}{\left|{x}\right|}$$
- No
so, the function
is
even