Math Problem Statement

Find a possible formula for the exponential function through the points (0, 4) and (2, 144) graphed below.

Solution

To find the formula for the exponential function that passes through the points (0,4)(0, 4) and (2,144)(2, 144), we can assume that the function has the form:

y=abxy = a \cdot b^x

where aa and bb are constants. We will use the two points provided to solve for aa and bb.

Step 1: Use the Point (0,4)(0, 4)

When x=0x = 0, y=4y = 4: 4=ab04 = a \cdot b^0 Since b0=1b^0 = 1, we get: a=4a = 4

So, the equation becomes: y=4bxy = 4 \cdot b^x

Step 2: Use the Point (2,144)(2, 144)

When x=2x = 2, y=144y = 144: 144=4b2144 = 4 \cdot b^2

Divide both sides by 4: 36=b236 = b^2

Take the square root of both sides to solve for bb: b=6b = 6

Final Equation

Now we can substitute a=4a = 4 and b=6b = 6 back into the equation: y=46xy = 4 \cdot 6^x

So, the exponential function that goes through the points (0,4)(0, 4) and (2,144)(2, 144) is: y=46xy = 4 \cdot 6^x

Would you like more details, or do you have any questions?


Here are some related questions for further exploration:

  1. How do you determine if a function is exponential from a graph alone?
  2. What are other common forms of exponential functions?
  3. How would the equation change if aa was negative?
  4. How can you verify this function using additional points on the graph?
  5. What happens to the graph if the base bb is less than 1?

Tip: To find an exponential equation given two points, first use the yy-intercept (where x=0x = 0) to solve for the initial value aa, then use a second point to solve for the base bb.

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Math Problem Analysis

Mathematical Concepts

Exponential Functions
Algebra

Formulas

y = a * b^x

Theorems

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Suitable Grade Level

Grades 9-12