Key to Practice Midterm III

Problem 1

A.  8x² -2x - 3

B.  25x² + 20x + 4

C.  x³ -10x² + 11

Problem 2

3x + 6 + (10x + 1)/(x² - 2x)

Problem 3

600

Problem 4

Problem 5

A.  m = 5/3 (sketch will be done in class)

B.  Undefined slope hence a vertical line with x-intercept (3,0)

Problem 6

A.  y = -4/3 + 13/3

B.  y = -2x - 1

Problem 7

Problem 8

A.  Domain:  {0,2,3,5} , Range:  {4,5,6}, This is a function

B.  Domain:  {1,2,3}, Range:  {3,5,6,7},  This is not a function

Problem 9

A.  {x|x not 2}

B.  {x|x >3}

Problem 10

A.  1/7

B.  2(x + h)² - 2 = 2x² + 4xh + h² - 2

C.  -1/3