1.
Factor
x
2
– 16.
A.
(
x
+ 4)(
x
– 4)
B.
(
x
– 4)(
x
– 4)
C.
(
x
+ 2)(
x
– 8)
D.
(
x
+ 4)(
x
+ 4)
Hint
2.
Factor
r
4
– 81.
A.
prime
B.
(
r
2
+ 9)(
r
+ 3)(
r
- 3)
C.
(
r
+ 3)
2
(
r
+ 3)
2
D.
(
r
2
+ 9)(
r
2
+ 9)
Hint
3.
Factor 7
xy
2
- 28
x
3
A.
(7
xy
+
x
)(
y
– 28
x
2
)
B.
7
x
(
y
+ 2
x
)(
y
- 2
x
)
C.
7
x
2
y
2
(1 +
x
)
D.
prime
Hint
4.
Factor
A.
B.
C.
D.
prime
Hint
5.
Suppose that we have a 3 ft. × 3 ft. piece of paper, and we cut out a square piece so that the area of the remaining piece is 5 feet. What is the length of a side of the square?
A.
B.
4 ft.
C.
2 ft.
D.
Hint