Mister Exam
Graphing y = x/log(x+1)
The solution
You have entered
[src]
x
f(x) = ----------
log(x + 1)
$$f{\left(x \right)} = \frac{x}{\log{\left(x + 1 \right)}}$$
f = x/log(x + 1)
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:
$$\frac{x}{\log{\left(x + 1 \right)}} = 0$$
Solve this equation
Solution is not found,
it's possible that the graph doesn't intersect the axis X
so we need to solve the equation:
$$\frac{x}{\log{\left(x + 1 \right)}} = 0$$
Solve this equation
Solution is not found,
it's possible that the graph doesn't intersect the axis X
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
$$- \frac{x}{\left(x + 1\right) \log{\left(x + 1 \right)}^{2}} + \frac{1}{\log{\left(x + 1 \right)}} = 0$$
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
$$- \frac{x}{\left(x + 1\right) \log{\left(x + 1 \right)}^{2}} + \frac{1}{\log{\left(x + 1 \right)}} = 0$$
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
$$\frac{\frac{x \left(1 + \frac{2}{\log{\left(x + 1 \right)}}\right)}{x + 1} - 2}{\left(x + 1\right) \log{\left(x + 1 \right)}^{2}} = 0$$
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
$$\frac{\frac{x \left(1 + \frac{2}{\log{\left(x + 1 \right)}}\right)}{x + 1} - 2}{\left(x + 1\right) \log{\left(x + 1 \right)}^{2}} = 0$$
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
$$\lim_{x \to -\infty}\left(\frac{x}{\log{\left(x + 1 \right)}}\right) = -\infty$$
Let's take the limit
so,
horizontal asymptote on the left doesn’t exist
$$\lim_{x \to \infty}\left(\frac{x}{\log{\left(x + 1 \right)}}\right) = \infty$$
Let's take the limit
so,
horizontal asymptote on the right doesn’t exist
$$\lim_{x \to -\infty}\left(\frac{x}{\log{\left(x + 1 \right)}}\right) = -\infty$$
Let's take the limit
so,
horizontal asymptote on the left doesn’t exist
$$\lim_{x \to \infty}\left(\frac{x}{\log{\left(x + 1 \right)}}\right) = \infty$$
Let's take the limit
so,
horizontal asymptote on the right doesn’t exist
Inclined asymptotes
Inclined asymptote can be found by calculating the limit of x/log(x + 1), divided by x at x->+oo and x ->-oo
$$\lim_{x \to -\infty} \frac{1}{\log{\left(x + 1 \right)}} = 0$$
Let's take the limit
so,
inclined coincides with the horizontal asymptote on the right
$$\lim_{x \to \infty} \frac{1}{\log{\left(x + 1 \right)}} = 0$$
Let's take the limit
so,
inclined coincides with the horizontal asymptote on the left
$$\lim_{x \to -\infty} \frac{1}{\log{\left(x + 1 \right)}} = 0$$
Let's take the limit
so,
inclined coincides with the horizontal asymptote on the right
$$\lim_{x \to \infty} \frac{1}{\log{\left(x + 1 \right)}} = 0$$
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:
$$\frac{x}{\log{\left(x + 1 \right)}} = - \frac{x}{\log{\left(1 - x \right)}}$$
- No
$$\frac{x}{\log{\left(x + 1 \right)}} = \frac{x}{\log{\left(1 - x \right)}}$$
- No
so, the function
not is
neither even, nor odd
So, check:
$$\frac{x}{\log{\left(x + 1 \right)}} = - \frac{x}{\log{\left(1 - x \right)}}$$
- No
$$\frac{x}{\log{\left(x + 1 \right)}} = \frac{x}{\log{\left(1 - x \right)}}$$
- No
so, the function
not is
neither even, nor odd