Math Problem Statement

Using the functions defined below, determine the indicated values: f(x) = 1 - 11x; g(x) = x^2 - x + 15

Solution

Let's work through the problems based on the functions given in the image:

We have two functions:

  • f(x)=111xf(x) = 1 - 11x
  • g(x)=x2x+15g(x) = x^2 - x + 15

(a) Find g(2)g(-2):

Substitute x=2x = -2 into g(x)g(x): g(2)=(2)2(2)+15=4+2+15=21g(-2) = (-2)^2 - (-2) + 15 = 4 + 2 + 15 = 21 Thus, g(2)=21g(-2) = 21.

(b) Find f(7)g(2)f(7) - g(-2):

We already know from part (a) that g(2)=21g(-2) = 21.

Now, calculate f(7)f(7): f(7)=111(7)=177=76f(7) = 1 - 11(7) = 1 - 77 = -76

Now, subtract g(2)g(-2) from f(7)f(7): f(7)g(2)=7621=97f(7) - g(-2) = -76 - 21 = -97 Thus, f(7)g(2)=97f(7) - g(-2) = -97.

(c) Find g(3)f(2)g(3) \cdot f(2):

First, calculate g(3)g(3): g(3)=(3)23+15=93+15=21g(3) = (3)^2 - 3 + 15 = 9 - 3 + 15 = 21

Now, calculate f(2)f(2): f(2)=111(2)=122=21f(2) = 1 - 11(2) = 1 - 22 = -21

Finally, multiply g(3)g(3) and f(2)f(2): g(3)f(2)=21(21)=441g(3) \cdot f(2) = 21 \cdot (-21) = -441 Thus, g(3)f(2)=441g(3) \cdot f(2) = -441.


If you have any questions or want further details on the steps, feel free to ask! Here are five additional related questions:

  1. What is the value of f(5)f(-5)?
  2. What happens to g(x)g(x) when x=0x = 0?
  3. What is the result of f(10)+g(10)f(10) + g(10)?
  4. Can you solve f(x)=g(x)f(x) = g(x) for xx?
  5. What is the product f(3)g(2)f(-3) \cdot g(2)?

Tip: Always check your substitutions carefully to avoid simple mistakes, especially when working with negative signs.

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Math Problem Analysis

Mathematical Concepts

Algebra
Functions
Quadratics

Formulas

f(x) = 1 - 11x
g(x) = x^2 - x + 15

Theorems

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Suitable Grade Level

Grades 9-10