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Math

Math Snap

PROBLEM

6. Consider the tables of values for the two functions shown.
\begin{tabular}{|c|c|c|} \hlinexx & y=f(x)y=f(x) & y=g(x)y=g(x) \\ \hline-2 & 5 & -2 \\ \hline-1 & 6 & 1 \\ \hline 0 & 8 & 2 \\ \hline 1 & 7 & 0 \\ \hline 2 & 9 & -1 \\ \hline \end{tabular}
Complete the table of values for the composite function y=f(g(x))y=f(g(x)).
\begin{tabular}{|c|c|} \hlinexx & y=f(g(x))y=f(g(x)) \\ \hline-2 & 5 \\ \hline-1 & 7 \\ \hline 0 & 9 \\ \hline 1 & 8 \\ \hline 2 & 6 \\ \hline \end{tabular}

STEP 1

What is this asking?
We're given two functions, f(x)f(x) and g(x)g(x), as tables of values, and we need to find the values of the composite function f(g(x))f(g(x)) for some given xx values.
Watch out!
Remember that f(g(x))f(g(x)) means we first apply g(x)g(x), and then apply f(x)f(x) to the result.
It's like a two-step process!
Don't mix up the order.

STEP 2

1. Evaluate g(x)g(x)
2. Evaluate f(g(x))f(g(x))

STEP 3

Let's start with x=2x = -2.
From the table, we see that g(2)=2g(-2) = -2.
This is our inner function result.
Keep this value in mind as we move to the next sub-step!

STEP 4

Now, let's do x=1x = -1.
We see g(1)=1g(-1) = 1.
Awesome!

STEP 5

For x=0x = 0, we have g(0)=2g(0) = 2.
See how we're just looking up the values in the g(x)g(x) table?

STEP 6

Next, for x=1x = 1, we find g(1)=0g(1) = 0.
Almost there!

STEP 7

Finally, for x=2x = 2, we have g(2)=1g(2) = -1.
We've found all the inner function values!

STEP 8

Remember that g(2)=2g(-2) = -2?
So, f(g(2))f(g(-2)) is the same as f(2)f(-2).
Looking at the table for f(x)f(x), we find f(2)=5f(-2) = 5.
So, f(g(2))=5f(g(-2)) = 5.
Boom!

STEP 9

We found g(1)=1g(-1) = 1, so we need f(1)f(1).
The table tells us f(1)=7f(1) = 7, so f(g(1))=7f(g(-1)) = 7.
Fantastic!

STEP 10

We have g(0)=2g(0) = 2, so we need f(2)f(2).
The table says f(2)=9f(2) = 9.
Thus, f(g(0))=9f(g(0)) = 9.
Keep it going!

STEP 11

Since g(1)=0g(1) = 0, we want f(0)f(0).
We see f(0)=8f(0) = 8, which means f(g(1))=8f(g(1)) = 8.
Almost done!

STEP 12

Lastly, we know g(2)=1g(2) = -1, so we need f(1)f(-1).
The table gives us f(1)=6f(-1) = 6, so f(g(2))=6f(g(2)) = 6.
We did it!

SOLUTION

Here's the completed table for y=f(g(x))y = f(g(x)):
xy=f(g(x))2517091826\begin{array}{cc} x & y=f(g(x)) \\ -2 & 5 \\ -1 & 7 \\ 0 & 9 \\ 1 & 8 \\ 2 & 6 \\ \end{array}

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