Math Problem Statement

Find f(4) and g(7) for the functions f(x) = -4x^2 - 3 and g(x) = -2x + 2. Simplify your answers as much as possible.

Solution

We are given two functions:

f(x)=4x23andg(x)=2x+2f(x) = -4x^2 - 3 \quad \text{and} \quad g(x) = -2x + 2

We need to find f(4)f(4) and g(7)g(7).

Step 1: Find f(4)f(4)

Substitute x=4x = 4 into the equation for f(x)f(x):

f(4)=4(4)23=4(16)3=643=67f(4) = -4(4)^2 - 3 = -4(16) - 3 = -64 - 3 = -67

So, f(4)=67f(4) = -67.

Step 2: Find g(7)g(7)

Substitute x=7x = 7 into the equation for g(x)g(x):

g(7)=2(7)+2=14+2=12g(7) = -2(7) + 2 = -14 + 2 = -12

So, g(7)=12g(7) = -12.

Final Answers:

  • f(4)=67f(4) = -67
  • g(7)=12g(7) = -12

Would you like further details or have any other questions? Here are 5 related questions you might find interesting:

  1. What happens to the values of f(x)f(x) and g(x)g(x) as xx increases indefinitely?
  2. What are the vertex and intercepts of the quadratic function f(x)=4x23f(x) = -4x^2 - 3?
  3. How does the slope of the linear function g(x)=2x+2g(x) = -2x + 2 affect its graph?
  4. Can you find the intersection points of f(x)f(x) and g(x)g(x)?
  5. How would you approach solving for xx if f(x)=0f(x) = 0?

Tip: For quadratic functions like f(x)=4x23f(x) = -4x^2 - 3, the negative coefficient of x2x^2 indicates that the parabola opens downward.

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Math Problem Analysis

Mathematical Concepts

Algebra
Functions
Quadratic Equations
Linear Equations

Formulas

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

Theorems

Substitution Method
Simplification

Suitable Grade Level

Grades 7-9