1.
Find (4
x
2
+ 3
x
) + (7
x
2
– 5
x
– 6).
A.
11
x
2
– 8
x
– 6
B.
11
x
4
– 2
x
2
– 6
C.
11
x
2
– 2
x
– 6
D.
9
x
– 6
Hint
2.
Find the difference (-7
x
4
y
2
– 3
x
2
y
+ 2
xy
2
– 5) – (4
x
4
y
2
–
xy
2
– 5).
A.
-3
x
4
y
2
- 4
xy
2
+ 2
xy
2
- 10
B.
-11
x
4
y
2
- 3
x
2
y
+
xy
2
- 10
C.
-11
x
4
y
2
- 3
x
2
y
+ 3
xy
2
D.
-11
x
4
y
2
- 3
x
2
y
+ 3
xy
2
- 10
Hint
3.
Find (4
x
2
– 2
x
– 3) + (–
x
2
+ 7
x
– 4).
A.
3
x
2
+ 5
x
– 7
B.
5
x
2
+ 5
x
– 7
C.
3
x
2
+ 5
x
+ 1
D.
5
x
2
+ 5
x
+ 1
Hint
4.
Find (–2
x
2
+ 5
x
– 1) – (3
x
2
– 4
x
– 6).
A.
–5
x
2
+
x
– 7
B.
–5
x
2
+
x
+ 5
C.
–5
x
2
+ 9
x
+ 5
D.
–5
x
2
+ 9
x
– 7
Hint
5.
Anthony and Sanford each throw a football. The height of Anthony's throw can represented by the equation
A
= –10
x
2
+ 15
x
+ 22, where
A
is height and
x
is the time in seconds. The height of Sanford's throw can represented by the equation
S
= –9
x
2
+ 14
x
+ 23. At time
x
, what is the combined height of the throws?
A.
x
2
–
x
+ 1
B.
19
x
2
+ 29
x
+ 45
C.
–19
x
2
+ 29
x
+ 45
D.
–
x
2
+
x
– 1
Hint