Solve Composite Function: g(f(x)) = 225?

In summary, to find g(f(x)), you plug the function f(x) into g(x). In this case, since g(x) is a constant function, g(f(x)) will always equal 5.
  • #1
Loppyfoot
194
0

Homework Statement


If f(x) = x3+3x2+4x+5 and g(x)=5, then g(f(x)) = ?


Homework Equations





The Attempt at a Solution


I don't know if I am correct.
g(f(x)) =
g(x3+3x2+4x+5)= 225?

I plugged 5 into the equation. Am I right?
 
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  • #2
Loppyfoot said:

Homework Statement


If f(x) = x3+3x2+4x+5 and g(x)=5, then g(f(x)) = ?


Homework Equations





The Attempt at a Solution


I don't know if I am correct.
g(f(x)) =
g(x3+3x2+4x+5)= 225?

I plugged 5 into the equation. Am I right?

If you plugged 5 into f(x), then you calculated f(5) = f(g(x)), since g(x) = 5. You want to find g(f(x)), which means plug f(x) into g(x).

If you're having trouble, maybe ask yourself, what's g(1), g(10), g(1000)? Once you see a pattern, then g(f(x)) shouldn't be much harder.
 
  • #3
How do I plug a function into an integer? Would g(f(x)) just be 5?
 
  • #4
g(x) isn't an integer. It's called a constant function. And yep, g(f(x))=5.
 

1. What is a composite function?

A composite function is a function that is formed by the composition of two or more functions. In other words, the output of one function becomes the input of another function.

2. How do you solve a composite function?

To solve a composite function, you need to substitute the inner function into the outer function. For example, in the equation g(f(x)) = 225, you would substitute f(x) for x in the function g. This will give you a new equation with one variable, which you can then solve for.

3. What is the purpose of using composite functions?

Composite functions are used to represent complex relationships between variables. They allow us to break down a complex problem into smaller, more manageable parts and analyze the relationship between them.

4. Can a composite function have more than two functions?

Yes, a composite function can have any number of functions. As long as the output of one function becomes the input of another, the functions can be composed together to create a composite function.

5. How do you know if a composite function is defined?

A composite function is defined if the range of the inner function is contained within the domain of the outer function. In other words, the output of the inner function must be a valid input for the outer function.

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