Key to the Practice Final

Problem 1

A.  (3x - 2)(2x + 1)

B.  (x - 5y)(x + 2y)

C.  4x²y³(2x + 3y)(2x - 3y)

Problem 2

A.  2/(2x + 1)

B.  4/(x² - 4x + 16)

Problem 3

A.  x = 10/3 or x = -4

B.  No solution

Problem 4

m = R/x² -b/x

Problem 5

A.  (2,3)

B.  Not shown here

Problem 6

x^3/50y^4/5

Problem 7

A.  sqrt(10) - 2sqrt(15) + 2sqrt(14) - sqrt(21) - sqrt(6) + sqrt(35)

B.  5/17 + 14/17 i

Problem 8

A.  x = 3

B.  x = 1/6 + sqrt(37) /6 or x = 1/6 - sqrt(37) /6

C.  x = (3sqrt(2) /2)i or x = -(3sqrt(2) /2)i

D.  x = 6 or x = -2

Problem 9

x = 3 or x = 1

Problem 10

10^-9