Math Problem Statement

If f left parenthesis x right parenthesis equals 3 x minus 3 and g left parenthesis x right parenthesis equals short dash x squared plus 4, then f left parenthesis 2 right parenthesis minus g left parenthesis short dash 2 right parenthesis =

Solution

Let's solve the expression step by step:

Given the functions:

f(x)=3x3f(x) = 3x - 3 g(x)=x2+4g(x) = -x^2 + 4

We are asked to find the value of:

f(2)g(2)f(2) - g(-2)

Step 1: Find f(2)f(2)

To find f(2)f(2), substitute x=2x = 2 into the function f(x)f(x):

f(2)=3(2)3=63=3f(2) = 3(2) - 3 = 6 - 3 = 3

Step 2: Find g(2)g(-2)

To find g(2)g(-2), substitute x=2x = -2 into the function g(x)g(x):

g(2)=(2)2+4=(4)+4=4+4=0g(-2) = -(-2)^2 + 4 = -(4) + 4 = -4 + 4 = 0

Step 3: Calculate f(2)g(2)f(2) - g(-2)

Now, subtract g(2)g(-2) from f(2)f(2):

f(2)g(2)=30=3f(2) - g(-2) = 3 - 0 = 3

Final Answer:

f(2)g(2)=3f(2) - g(-2) = 3


Would you like any further explanation or details on this?

Here are 5 related questions you can explore:

  1. What is the composition of the functions f(x)f(x) and g(x)g(x)?
  2. How would the value of f(2)g(2)f(2) - g(-2) change if the functions were modified?
  3. How do you evaluate a function at a specific point like g(2)g(-2)?
  4. What is the general method for finding f(a)g(b)f(a) - g(b) for any functions?
  5. How can we graph the functions f(x)f(x) and g(x)g(x)?

Tip: Always remember to plug in the exact values for xx in each function and simplify carefully.

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Math Problem Analysis

Mathematical Concepts

Function Evaluation
Algebra
Basic Arithmetic

Formulas

f(x) = 3x - 3
g(x) = -x^2 + 4

Theorems

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Suitable Grade Level

Grades 7-9