Mister Exam
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-
How to use it?
- Graphing y =:
- x³+3x²-9x+1
- x^3-3*x^2+2
- x^3+3x^2-24x-21
- -x^3-2
- Derivative of:
-
(x^2-7)/x
-
Identical expressions
- (x^ two - seven)/x
- (x squared minus 7) divide by x
- (x to the power of two minus seven) divide by x
- (x2-7)/x
- x2-7/x
- (x²-7)/x
- (x to the power of 2-7)/x
- x^2-7/x
- (x^2-7) divide by x
-
Similar expressions
- (x^2+7)/x
Graphing y = (x^2-7)/x
The solution
You have entered
[src]
2
x - 7
f(x) = ------
x
$$f{\left(x \right)} = \frac{x^{2} - 7}{x}$$
f = (x^2 - 7)/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:
$$\frac{x^{2} - 7}{x} = 0$$
Solve this equation
The points of intersection with the axis X:
Analytical solution
$$x_{1} = - \sqrt{7}$$
$$x_{2} = \sqrt{7}$$
Numerical solution
$$x_{1} = -2.64575131106459$$
$$x_{2} = 2.64575131106459$$
so we need to solve the equation:
$$\frac{x^{2} - 7}{x} = 0$$
Solve this equation
The points of intersection with the axis X:
Analytical solution
$$x_{1} = - \sqrt{7}$$
$$x_{2} = \sqrt{7}$$
Numerical solution
$$x_{1} = -2.64575131106459$$
$$x_{2} = 2.64575131106459$$
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
$$2 - \frac{x^{2} - 7}{x^{2}} = 0$$
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
$$2 - \frac{x^{2} - 7}{x^{2}} = 0$$
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
$$\frac{2 \left(-1 + \frac{x^{2} - 7}{x^{2}}\right)}{x} = 0$$
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
$$\frac{2 \left(-1 + \frac{x^{2} - 7}{x^{2}}\right)}{x} = 0$$
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
$$\lim_{x \to -\infty}\left(\frac{x^{2} - 7}{x}\right) = -\infty$$
Let's take the limit
so,
horizontal asymptote on the left doesn’t exist
$$\lim_{x \to \infty}\left(\frac{x^{2} - 7}{x}\right) = \infty$$
Let's take the limit
so,
horizontal asymptote on the right doesn’t exist
$$\lim_{x \to -\infty}\left(\frac{x^{2} - 7}{x}\right) = -\infty$$
Let's take the limit
so,
horizontal asymptote on the left doesn’t exist
$$\lim_{x \to \infty}\left(\frac{x^{2} - 7}{x}\right) = \infty$$
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^2 - 7)/x, divided by x at x->+oo and x ->-oo
$$\lim_{x \to -\infty}\left(\frac{x^{2} - 7}{x^{2}}\right) = 1$$
Let's take the limit
so,
inclined asymptote equation on the left:
$$y = x$$
$$\lim_{x \to \infty}\left(\frac{x^{2} - 7}{x^{2}}\right) = 1$$
Let's take the limit
so,
inclined asymptote equation on the right:
$$y = x$$
$$\lim_{x \to -\infty}\left(\frac{x^{2} - 7}{x^{2}}\right) = 1$$
Let's take the limit
so,
inclined asymptote equation on the left:
$$y = x$$
$$\lim_{x \to \infty}\left(\frac{x^{2} - 7}{x^{2}}\right) = 1$$
Let's take the limit
so,
inclined asymptote equation on the right:
$$y = x$$
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:
$$\frac{x^{2} - 7}{x} = - \frac{x^{2} - 7}{x}$$
- No
$$\frac{x^{2} - 7}{x} = \frac{x^{2} - 7}{x}$$
- No
so, the function
not is
neither even, nor odd
So, check:
$$\frac{x^{2} - 7}{x} = - \frac{x^{2} - 7}{x}$$
- No
$$\frac{x^{2} - 7}{x} = \frac{x^{2} - 7}{x}$$
- No
so, the function
not is
neither even, nor odd