Chapter 2 Self Test

Press  for True  and    for False.

1) Solve for x:  8x - 2 = 13 - 2x.

       x = 2/3            

2) Use a graphing utility to approximate the solution(s) of 1/2 (x2 - 9x + 19) = 0

     x= 3.38, 5.62        

3) Multiply: (3 + 7i)(6 - 2i).

      Answer = 18 - 14i             

4)  3x2- 6x + 2 = 0   has imaginary zeros.        

5) Use the cost equation, C(x)= 0.5x2 + 15x + 6000, to find the number of units, x, that a manufacturer can produce with a total cost, C, of $13,700.

x= 110           

6) Use the discriminant to determine the number of real solutions: 5x2- 7x + 16 = 0.

 The equation has exactly one real solution .        

7) The revenue for selling x units of a product is R = 4.50x. The cost of producing x units is 3x + 3717. In order to obtain a profit, the revenue must be greater than the cost. For what values of x will this product return a profit?

 x > 2,478          

8) The domain of   sqrt(36 - x2) = [-6, 6]        

9) Use a graphing utility to solve 2x2 + 3x < 5.

 [-2.5, inf)             

10) When doing a linear regression , a r value of -1 means there is  an excellent correlation.      

11)         This scatter plot  has a negative correlation      

 

 12)  The graph of : y = x3 - 2x 2- 3x   has 3 x-intercepts.          


Note: if you did well on this, then submit the chapter quizzes and proceed to chapter 3. If not, email me, or post mesages to the webboard.

    Joan Bookbinder