1.
Which statement below is
not
correct?
A.
(3
a
+ 1)
2
= 9
a
2
+ 6
a
+ 1
B.
(2
b
- 5)
2
= 4
b
2
- 20
b
+ 25
C.
(
x
+ 2)
2
=
x
2
+ 4
x
+ 4
D.
(5
y
- 7)
2
= 25
y
2
+ 70
y
+ 49
Hint
2.
Find the product (2
z
- 5
x
)
2
.
A.
4
z
2
- 25
x
2
B.
4
z
2
- 20
zx
+ 25
x
2
C.
4
z
2
+ 25
x
2
D.
4
z
2
- 25
x
2
- 20
Hint
3.
Which equation represents the square of a sum?
A.
(
a
–
b
)
2
=
a
2
– 2
a
b
+
b
2
B.
(
a
+
b
)(
a
–
b
) =
a
2
–
b
2
C.
(
a
+
b
)
2
=
a
2
+ 2
a
b
+
b
2
D.
(
a
+
b
)(
a
–
b
) =
a
2
+
b
2
Hint
4.
In genetics dimples are a dominant trait. If a mother and father each have a 50% chance of passing a dominant gene for dimples, what is the chance that their baby would not have dimples?
A.
75%
B.
50%
C.
0%
D.
25%
Hint
5.
Find the product (12
j
+ 3
k
)(12
j
– 3
k
).
A.
24
j
+ 6
k
B.
24
j
C.
144
j
2
– 9
k
2
D.
144
j
2
+ 9
k
2
Hint