Solution: First compute $ f(4) = 3(4) - 7 = 12 - 7 = 5 $. Then substitute into $ g(x) $: $ g(5) = 5^2 + 2(5) = 25 + 10 = 35 $. The value of $ g(f(4)) $ is $ \boxed35 $. - Coaching Toolbox
Understanding Function Composition: How to Evaluate $ g(f(4)) $ Step by Step
Understanding Function Composition: How to Evaluate $ g(f(4)) $ Step by Step
Function composition is a powerful concept in mathematics that allows us to build complex transformations by combining simpler functions. In this article, we’ll explore a clear example of computing $ g(f(4)) $, using step-by-step calculations to illustrate the process.
Understanding the Context
Step 1: Compute $ f(4) $
We begin by evaluating the inner function $ f(x) $. Although the exact definition of $ f(x) $ isn’t provided in this example, our scenario assumes a straightforward linear function:
$$
f(x) = 3x - 7
$$
Now substitute $ x = 4 $ into the function:
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Key Insights
$$
f(4) = 3(4) - 7 = 12 - 7 = 5
$$
This first evaluation is crucial — it feeds the output of $ f $ directly into the next function.
Step 2: Substitute $ f(4) $ into $ g(x) $
Next, we use the result $ f(4) = 5 $ as the input for the function $ g(x) $. According to the problem, $ g(x) $ is defined as:
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$$
g(x) = x^2 + 2x
$$
Now substitute $ x = 5 $ into $ g(x) $:
$$
g(5) = (5)^2 + 2(5) = 25 + 10 = 35
$$
Final Result
Putting it all together:
$$
g(f(4)) = g(5) = 35
$$
Thus, the final value is:
$$
oxed{35}
$$
