25.For the polynomial functions defined by
and
find (a) , (b) (c) and (d)
Factor each polynomial completely.
29.Solve the equation
30.Write in lowest terms.
Perform the indicated operations. Express the answer in lowest terms.
34.Solve the equation
Solve each problem.
35.Machine A can complete a certain job in 2 hr. To speed up the work, Machine B, which
could complete the job alone in 3 hr, is brought in to help. How long will it take the two
machines to complete the job working together?
36.The cost of a pizza varies directly as the square of its radius. If a pizza with a 7-in. radius
costs $6.00, how much should a pizza with a 9-in. radius cost?
+
4 x+ 1
x
=
- 3
x^2 +x
.
x+ 4
x- 2
+
2 x- 10
x- 2
x^2 - 9
2 x+ 4
,
x^3 - 27
4
2 a^2
a+b
#a-b
4 a
y^2 - 16
y^2 - 8 y+ 16
3 x^2 + 4 x=7.
2 x^2 - 13 x- 45 100 t^4 - 25 8 p^3 + 125
1 ƒ+g 21 x 2 1 g-ƒ 21 x 2 , 1 ƒ+g 21 - 12 , 1 ƒh 21 x 2.
ƒ 1 x 2 =x^2 + 2 x-3, g 1 x 2 = 2 x^3 - 3 x^2 + 4 x-1, h 1 x 2 =x^2 ,
426 CHAPTER 7 Rational Expressions and Functions
