Big Ideas Math Algebra 1, 2015
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Big Ideas Math Algebra 1, 2015 View details
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Exercise 8 Page 473

How do consecutive terms relate to each other?

Type of Function: Exponential
Function: y=8(2)^x

Practice makes perfect

We want to tell whether the table of values represents a linear, exponential, or quadratic function. To do so, we will analyze how the consecutive terms are related to each other.

Note that the difference between consecutive x-values is always 1 — it is constant. Additionally, the consecutive y-values have a common ratio of 2. This means that the table represents an exponential function. Let's recall the general form of this type of function. y=ab^x We will use two ordered pairs given in the table to find the values of a and b. For simplicity, let's use (0,8) and (1,16). We will start by substituting 0 and 8 for x and y, respectively.
y=ab^x
8=ab^0
Solve for a
8=a(1)
8=a
a=8
We can write a partial equation of the function represented by the table. y=8b^x To find the value of b we will substitute 1 for x and 16 for y into our partial equation.
y=8b^x
16=8b^1
Solve for b
16=8b
2=b
b=2
Now we can write the equation of the function represented by the table. y=8(2)^x