Your Algebra Homework Can Now Be Easier Than Ever!

Math 107 Test 2

READ ALL DIRECTIONS CAREFULLY:
- Turn o and put away all cell phones, pagers, iPods, cd players, etc.
-Write your name, test version, and row number on the outside of your blue book.
-Write ALL work and answers in your blue book - we will NOT look for, or grade,
work on the test sheet.
-You must SHOW ALL WORK for full credit.
-When you are finished, fold your test so that it fits inside your blue book and turn
in the test and blue book.

1. (20 Points) The price, p, in dollars, and the quantity, x, sold of a certain product obey the
demand equation below :

(a) Express the revenue R as a function of x.
(b) What quantity maximizes revenue?
(c) What is the maximum revenue?
(d) What price should the company charge to maximize revenue?

2. (10 Points) A farmer with 6000 meters of fencing wants to enclose a rectangular plot split in
two that borders on a river. The farmer does not fence the side along the river. Express the area
A of the rectangle as a function of x.

Things we know: A = xy and P = 3x + y = 6000
So we can solve for y in terms of x using the perimeter and get y = 6000 - 3x. Then we plug this
in to our equation for A.
A = xy = x(6000 - 3x) = 6000x - 3x^2

3. (20 Points) Given the following polynomial

(a) What is the degree of the function?
(b) List each real zero, its multiplicity , and whether the graph crosses or touches the x-axis at
each zero. Write it in a form similar to the chart below . (Hint: The multiplicities add up to the degree.)

zero multiplicity graph behavior
     

(c) Find the power function that the graph of f(x) resembles for large values of |x|.

(a) The degree is 11.

zero multiplicity graph behavior
0
-7
3
-3
1
2
4
4
cross
touch
touch
touch

(c) f(x) resembles -5x11 for large values of |x|.

4. (12 Points) Given the following rational function :

(a) What is the domain of R(x)?
(b) Find any vertical asymptotes or holes. Show work to justify your answer.
(c) Find any horizontal asymptotes. Show work to justify your answer.

(a) Domain: All reals except x = -1 and x = -3.
Know because Red Flag! Cannot have 0 in the denominator.
(b) VA or holes:

So, there is a hole at x = -1 and VA at x = -3.
(c) Degree of the numerator is 3 and degree of the denominator is 2, so we do not have a HA.

5. (12 Points) Solve this inequality algebraically:

Step One: done

Step Two: Since the function can be factored to be we see that we have VAs at
x = 3 and x = -3 and a zero at x = 4.

Steps Three and Four: We can see that our intervals are Thus
we pick test points in each interval and check whether the value of f at these points are positive
or negative .

The answer is that when x is in [-3, 3] or x is in

6. (10 Points) Given the following function:

(a) List all potential rational zeros.
(b) Use synthetic division to find the quotient and remainder when f(x) is divided by (x - 1).
Write f(x) in the form f(x) = (x - 1)*quotient + remainder.
(c) What conclusions can you make about (x-1)? What conclusion can you make about x = 1?

(b) Using synthetic division, we find

(c) (x - 1) is a factor of f(x) and x = 1 is a root /zero/x-intercept of f(x).

7. (5 Points) What is the remainder if is divided by (x - 1)?

8. (5 Points) Write the equation (make one up) of a rational function that has a horizontal asymptote at y = 0.

Any function where the degree on the bottom is more than the degree on top will work.

9. (6 Points) Given f(x) = -4x^2 + 5x - 2:

(a) Does this f(x) have a maximum or a minimum? How do you know?
(b) Where does the maximum or minimum occur and what is its value?

(a) f(x) has a maximum because a is negative, so the parabola opens downward.
(b) This maximum occurs at the vertex , so it occurs when x = 5/8 and the maximum value is f(5/8) = -.4375.

Prev Next

Start solving your Algebra Problems in next 5 minutes!

Algebra Helper
Download (and optional CD)

Only $39.99

Click to Buy Now:


OR

2Checkout.com is an authorized reseller
of goods provided by Sofmath

Attention: We are currently running a special promotional offer for Algebra-Answer.com visitors -- if you order Algebra Helper by midnight of March 28th you will pay only $39.99 instead of our regular price of $74.99 -- this is $35 in savings ! In order to take advantage of this offer, you need to order by clicking on one of the buttons on the left, not through our regular order page.

If you order now you will also receive 30 minute live session from tutor.com for a 1$!

You Will Learn Algebra Better - Guaranteed!

Just take a look how incredibly simple Algebra Helper is:

Step 1 : Enter your homework problem in an easy WYSIWYG (What you see is what you get) algebra editor:

Step 2 : Let Algebra Helper solve it:

Step 3 : Ask for an explanation for the steps you don't understand:



Algebra Helper can solve problems in all the following areas:

  • simplification of algebraic expressions (operations with polynomials (simplifying, degree, synthetic division...), exponential expressions, fractions and roots (radicals), absolute values)
  • factoring and expanding expressions
  • finding LCM and GCF
  • (simplifying, rationalizing complex denominators...)
  • solving linear, quadratic and many other equations and inequalities (including basic logarithmic and exponential equations)
  • solving a system of two and three linear equations (including Cramer's rule)
  • graphing curves (lines, parabolas, hyperbolas, circles, ellipses, equation and inequality solutions)
  • graphing general functions
  • operations with functions (composition, inverse, range, domain...)
  • simplifying logarithms
  • basic geometry and trigonometry (similarity, calculating trig functions, right triangle...)
  • arithmetic and other pre-algebra topics (ratios, proportions, measurements...)

ORDER NOW!

Algebra Helper
Download (and optional CD)

Only $39.99

Click to Buy Now:


OR

2Checkout.com is an authorized reseller
of goods provided by Sofmath
Check out our demo!
 
"It really helped me with my homework.  I was stuck on some problems and your software walked me step by step through the process..."
C. Sievert, KY
 
 
Sofmath
19179 Blanco #105-234
San Antonio, TX 78258
Phone: (512) 788-5675
Fax: (512) 519-1805
 

Home   : :   Features   : :   Demo   : :   FAQ   : :   Order

Copyright © 2004-2024, Algebra-Answer.Com.  All rights reserved.