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zah16
05.02.2021 •
Mathematics
Identify the key features of these functions:
f(x) = 3(x + 5)2 − 10
g(x) = 200(0.95)x
h(x) = -0.25(x + 3)(x − 1)
The vertex of f(x) is at
. The function g(x) is decreasing at a rate of
%. The zeros of h(x) are at
and
.
Solved
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Ответ:
The vertex of f(x) is at (-5,-10).
The function g(x) is decreasing at a rate of 5%.
The zeros of h(x) are at x = -3 and x = 1.
Step-by-step explanation:
Vertex of a quadratic function:
Suppose we have a quadratic function in the following format:
It's vertex is the point![(x_{v}, f(x_{v})](/tpl/images/1095/5699/53c27.png)
In which
If a<0, the vertex is a maximum point, that is, the maximum value happens at
, and it's value is ![f(x_{v})](/tpl/images/1095/5699/5efde.png)
Decaying exponential function:
A decaying exponential function has the following format:
In which A(0) is the initial quantity and r is the decay rate.
Zeros of a function:
Given a polynomial f(x), this polynomial has roots
such that it can be written as:
, in which a is the leading coefficient.
Vertex of f:
The function f is given by:
Expanding the calculations to place at the correct format:
Which means that
The x-value of the vertex is:
The y-value of the vertex is:
The vertex of f(x) is at (-5,-10).
Decreasing rate of g(x).
We have that:
1 - r = 0.95
So
r = 1 - 0.95 = 0.05
Which means that the decreasing rate is of 5%.
The zeros of h(x) are
The zeros are
x + 3 = 0 -> x = -3
x - 1 = 0 -> x = 1
So
The zeros of h(x) are at x = -3 and x = 1.
Ответ:
Therefore rounded to the nearest thousandth his batting average is 0.422