Math Problem Statement

Find an equation for the exponential function graphed.

Find an equation for the exponential function graphed.

Solution

The graph shows an exponential function f(x)f(x), and it passes through the point (0,2)(0, \sqrt{2}). Based on this, we can derive the general form of the equation of the function.

General form of an exponential function:

The general form of an exponential function is:

f(x)=abxf(x) = ab^x

Where:

  • aa is the initial value (the yy-intercept, when x=0x = 0),
  • bb is the base of the exponential function.

Step 1: Use the given point (0,2)(0, \sqrt{2})

From the graph, we know the function passes through (0,2)(0, \sqrt{2}). This tells us that when x=0x = 0, f(x)=2f(x) = \sqrt{2}. Plugging this into the general equation:

f(0)=ab0=a1=af(0) = a \cdot b^0 = a \cdot 1 = a So, a=2a = \sqrt{2}.

Step 2: Determine bb

Next, we need to determine bb. From the graph, it appears that the function is increasing exponentially, meaning b>1b > 1. However, we don't have another exact point to directly calculate bb, but we can hypothesize that the base could be b=eb = e, which is a common base for exponential functions.

So, the equation of the exponential function is:

f(x)=2exf(x) = \sqrt{2} \cdot e^x

This is a reasonable assumption based on the graph's shape and the common use of ee in exponential growth problems.

Let me know if you'd like further details or clarifications!

Related questions:

  1. How can we verify if b=eb = e is the correct base for this function?
  2. What would the equation look like if the base bb were not ee?
  3. How does changing the base bb affect the steepness of the graph?
  4. What is the domain and range of this exponential function?
  5. How would the graph change if we multiplied exe^x by a constant other than 2\sqrt{2}?

Tip:

When analyzing exponential functions, look for points where x=0x = 0 to quickly determine the initial value, and use other points to find the base.

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Math Problem Analysis

Mathematical Concepts

Exponential Functions
Algebra
Graphs of Functions

Formulas

f(x) = ab^x
f(x) = sqrt(2) * e^x

Theorems

Properties of Exponential Growth
Behavior of e^x

Suitable Grade Level

Grades 10-12