Mister Exam
Graphing y = log(5)^x-3
The solution
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x f(x) = log (5) - 3
$$f{\left(x \right)} = \log{\left(5 \right)}^{x} - 3$$
f = log(5)^x - 3
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:
$$\log{\left(5 \right)}^{x} - 3 = 0$$
Solve this equation
The points of intersection with the axis X:
Analytical solution
$$x_{1} = \frac{\log{\left(3 \right)}}{\log{\left(\log{\left(5 \right)} \right)}}$$
Numerical solution
$$x_{1} = 2.30856677444296$$
so we need to solve the equation:
$$\log{\left(5 \right)}^{x} - 3 = 0$$
Solve this equation
The points of intersection with the axis X:
Analytical solution
$$x_{1} = \frac{\log{\left(3 \right)}}{\log{\left(\log{\left(5 \right)} \right)}}$$
Numerical solution
$$x_{1} = 2.30856677444296$$
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
$$\log{\left(5 \right)}^{x} \log{\left(\log{\left(5 \right)} \right)} = 0$$
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
$$\log{\left(5 \right)}^{x} \log{\left(\log{\left(5 \right)} \right)} = 0$$
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
$$\log{\left(5 \right)}^{x} \log{\left(\log{\left(5 \right)} \right)}^{2} = 0$$
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
$$\log{\left(5 \right)}^{x} \log{\left(\log{\left(5 \right)} \right)}^{2} = 0$$
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
$$\lim_{x \to -\infty}\left(\log{\left(5 \right)}^{x} - 3\right) = -3$$
Let's take the limit
so,
equation of the horizontal asymptote on the left:
$$y = -3$$
$$\lim_{x \to \infty}\left(\log{\left(5 \right)}^{x} - 3\right) = \infty$$
Let's take the limit
so,
horizontal asymptote on the right doesn’t exist
$$\lim_{x \to -\infty}\left(\log{\left(5 \right)}^{x} - 3\right) = -3$$
Let's take the limit
so,
equation of the horizontal asymptote on the left:
$$y = -3$$
$$\lim_{x \to \infty}\left(\log{\left(5 \right)}^{x} - 3\right) = \infty$$
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 log(5)^x - 3, divided by x at x->+oo and x ->-oo
$$\lim_{x \to -\infty}\left(\frac{\log{\left(5 \right)}^{x} - 3}{x}\right) = 0$$
Let's take the limit
so,
inclined coincides with the horizontal asymptote on the right
$$\lim_{x \to \infty}\left(\frac{\log{\left(5 \right)}^{x} - 3}{x}\right) = \infty$$
Let's take the limit
so,
inclined asymptote on the right doesn’t exist
$$\lim_{x \to -\infty}\left(\frac{\log{\left(5 \right)}^{x} - 3}{x}\right) = 0$$
Let's take the limit
so,
inclined coincides with the horizontal asymptote on the right
$$\lim_{x \to \infty}\left(\frac{\log{\left(5 \right)}^{x} - 3}{x}\right) = \infty$$
Let's take the limit
so,
inclined asymptote on the right doesn’t exist
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:
$$\log{\left(5 \right)}^{x} - 3 = -3 + \log{\left(5 \right)}^{- x}$$
- No
$$\log{\left(5 \right)}^{x} - 3 = 3 - \log{\left(5 \right)}^{- x}$$
- No
so, the function
not is
neither even, nor odd
So, check:
$$\log{\left(5 \right)}^{x} - 3 = -3 + \log{\left(5 \right)}^{- x}$$
- No
$$\log{\left(5 \right)}^{x} - 3 = 3 - \log{\left(5 \right)}^{- x}$$
- No
so, the function
not is
neither even, nor odd