Inequalities of combined functions

All in One Place

Everything you need for better marks in university, secondary, and primary classes.

Learn with Ease

We’ve mastered courses for WA, NSW, QLD, SA, and VIC, so you can study with confidence.

Instant and Unlimited Help

Get the best tips, walkthroughs, and practice questions.

0/1
?
Intros
Lessons
  1. Introduction to inequalities of combined functions

    i. What are inequalities of combined functions?

    ii. How many ways can it be solved?

0/10
?
Examples
Lessons
  1. Evaluating Inequalities of Combined Functions by Comparing the Functions Graphically

    Let f(x)=2x2f(x) = 2x^{2} and g(x)=3x+2g(x) = 3x + 2.

    1. Graph the functions on the same set of axes. Identify the points of intersection.
    2. Illustrate the regions for which

      i. f(x)f(x) > g(x)g(x)

      ii. g(x)g(x) > f(x)f(x)

  2. Evaluating Inequalities of Combined Functions by Analyzing the Difference Function

    Let f(x)=2x2+x3f(x) = 2x^{2} + x - 3 and g(x)=x2+x+13g(x) = x^{2} + x + 13.

    1. Graph the difference function.
    2. Illustrate the regions for which

      i. f(x)f(x) > g(x)g(x)

      ii. g(x)g(x) > f(x)f(x)

  3. Let f(x)=(x3)(x+5)f(x) = (x-3)(x+5) and g(x)=(x+1)(x4)g(x) = (x+1)(x-4)
    1. Graph the difference function.
    2. Illustrate the regions for which

      i. f(x)f(x) > g(x)g(x)

      ii. g(x)g(x) > f(x)f(x)

  4. Evaluating Inequalities of Combined Functions by Analyzing the Quotient Function

    Let f(x)=(x+3)6f(x) = (x+3)^{6} and g(x)=(x+3)4g(x) = (x+3)^{4}

    1. Graph the quotient function.
    2. Illustrate the regions for which

      i. f(x)f(x) > g(x)g(x)

      ii. g(x)g(x) > f(x)f(x)

  5. Application of Inequalities of Combined Functions

    Nick is starting his own phone company. The cost of making and storing phones can be modelled by the function:

    C(n)=1.2n+150,000nC(n) = 1.2n + \frac{150,000}{n}

    where nn = number of phones. The storage capacity of the company's warehouse is 500 units.

    1. Use graphing technology to graph C(nn). What is the domain of this function?
    2. Determine the number of phones that can be made if Nick wants to keep the cost below $1000.
Topic Notes
?

Difference function:

f(x)f(x) > g(x)g(x) f(x)g(x) f(x) - g (x) > 00

Quotient function:

f(x)f(x) > g(x)g(x) f(x)g(x) \frac{f(x)}{g(x)} > 11