Mister Exam

Graphing y = exp(-sqrt(x))

v

The graph:

from to

Intersection points:

does show?

Piecewise:

The solution

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        -\/ x 
f(x) = e      
$$f{\left(x \right)} = e^{- \sqrt{x}}$$
f = exp(-sqrt(x))
The graph of the function
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:
$$e^{- \sqrt{x}} = 0$$
Solve this equation
Solution is not found,
it's possible that the graph doesn't intersect the axis X
The points of intersection with the Y axis coordinate
The graph crosses Y axis when x equals 0:
substitute x = 0 to exp(-sqrt(x)).
$$e^{- \sqrt{0}}$$
The result:
$$f{\left(0 \right)} = 1$$
The point:
(0, 1)
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
$$- \frac{e^{- \sqrt{x}}}{2 \sqrt{x}} = 0$$
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
$$\frac{\left(\frac{1}{x} + \frac{1}{x^{\frac{3}{2}}}\right) e^{- \sqrt{x}}}{4} = 0$$
Solve this equation
Solutions are not found,
maybe, the function has no inflections
Horizontal asymptotes
Let’s find horizontal asymptotes with help of the limits of this function at x->+oo and x->-oo
Limit on the left could not be calculated
$$\lim_{x \to -\infty} e^{- \sqrt{x}}$$
$$\lim_{x \to \infty} e^{- \sqrt{x}} = 0$$
Let's take the limit
so,
equation of the horizontal asymptote on the right:
$$y = 0$$
Inclined asymptotes
Inclined asymptote can be found by calculating the limit of exp(-sqrt(x)), divided by x at x->+oo and x ->-oo
Limit on the left could not be calculated
$$\lim_{x \to -\infty}\left(\frac{e^{- \sqrt{x}}}{x}\right)$$
$$\lim_{x \to \infty}\left(\frac{e^{- \sqrt{x}}}{x}\right) = 0$$
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:
$$e^{- \sqrt{x}} = e^{- \sqrt{- x}}$$
- No
$$e^{- \sqrt{x}} = - e^{- \sqrt{- x}}$$
- No
so, the function
not is
neither even, nor odd