Write an exponential function that contains the points (3,32) and (6,256).

Algebra and Trigonometry (6th Edition)
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ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
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Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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for example: f(x)=3*2^x write the thing and look at the picture asap ty

### Problem Statement
Write an exponential function that contains the points \( (3,32) \) and \( (6,256) \).

### Solution

To find the exponential function that passes through the given points, we start with the general form of an exponential function:

\[ y = ab^x \]

Using the given points, we can set up a system of equations. For the point \( (3, 32) \):

\[ 32 = ab^3 \]

For the point \( (6, 256) \):

\[ 256 = ab^6 \]

By dividing the second equation by the first, we eliminate \(a\) and solve for \(b\):

\[ \frac{256}{32} = \frac{ab^6}{ab^3} \]

\[ 8 = b^3 \]

Taking the cube root of both sides:

\[ b = \sqrt[3]{8} \]

\[ b = 2 \]

Now that we have \( b \), we can substitute it back into the first equation to solve for \(a\):

\[ 32 = a(2)^3 \]

\[ 32 = a \cdot 8 \]

\[ a = \frac{32}{8} \]

\[ a = 4 \]

Thus, the exponential function that contains the points \( (3, 32) \) and \( (6, 256) \) is:

\[ y = 4 \cdot 2^x \]

### Verification

To ensure our solution is correct, let's verify the function with the given points:

- For \( (3, 32) \):
  \[ y = 4 \cdot 2^3 = 4 \cdot 8 = 32 \]

- For \( (6, 256) \):
  \[ y = 4 \cdot 2^6 = 4 \cdot 64 = 256 \]

Both points satisfy the equation, confirming that the derived exponential function \( y = 4 \cdot 2^x \) is accurate.
Transcribed Image Text:### Problem Statement Write an exponential function that contains the points \( (3,32) \) and \( (6,256) \). ### Solution To find the exponential function that passes through the given points, we start with the general form of an exponential function: \[ y = ab^x \] Using the given points, we can set up a system of equations. For the point \( (3, 32) \): \[ 32 = ab^3 \] For the point \( (6, 256) \): \[ 256 = ab^6 \] By dividing the second equation by the first, we eliminate \(a\) and solve for \(b\): \[ \frac{256}{32} = \frac{ab^6}{ab^3} \] \[ 8 = b^3 \] Taking the cube root of both sides: \[ b = \sqrt[3]{8} \] \[ b = 2 \] Now that we have \( b \), we can substitute it back into the first equation to solve for \(a\): \[ 32 = a(2)^3 \] \[ 32 = a \cdot 8 \] \[ a = \frac{32}{8} \] \[ a = 4 \] Thus, the exponential function that contains the points \( (3, 32) \) and \( (6, 256) \) is: \[ y = 4 \cdot 2^x \] ### Verification To ensure our solution is correct, let's verify the function with the given points: - For \( (3, 32) \): \[ y = 4 \cdot 2^3 = 4 \cdot 8 = 32 \] - For \( (6, 256) \): \[ y = 4 \cdot 2^6 = 4 \cdot 64 = 256 \] Both points satisfy the equation, confirming that the derived exponential function \( y = 4 \cdot 2^x \) is accurate.
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