1.
Which statement below is
not
correct?
A.
(5
y
- 7)
2
= 25
y
2
+ 70
y
+ 49
B.
(2
b
- 5)
2
= 4
b
2
- 20
b
+ 25
C.
(
x
+ 2)
2
=
x
2
+ 4
x
+ 4
D.
(3
a
+ 1)
2
= 9
a
2
+ 6
a
+ 1
Hint
2.
Which equation represents the square of a sum?
A.
(
a
+
b
)(
a
–
b
) =
a
2
–
b
2
B.
(
a
+
b
)
2
=
a
2
+ 2
a
b
+
b
2
C.
(
a
+
b
)(
a
–
b
) =
a
2
+
b
2
D.
(
a
–
b
)
2
=
a
2
– 2
a
b
+
b
2
Hint
3.
Which equation represents the square of a difference?
A.
(
a
–
b
)
2
=
a
2
– 2
a
b
+
b
2
B.
(
a
+
b
)(
a
–
b
) =
a
2
–
b
2
C.
(
a
+
b
)(
a
–
b
) =
a
2
+
b
2
D.
(
a
+
b
)
2
=
a
2
+ 2
a
b
+
b
2
Hint
4.
Which equation represents the product of a sum and a difference?
A.
(
a
+
b
)
2
=
a
2
+ 2
a
b
+
b
2
B.
(
a
+
b
)(
a
–
b
) =
a
2
+
b
2
C.
(
a
+
b
)(
a
–
b
) =
a
2
–
b
2
D.
(
a
–
b
)
2
=
a
2
– 2
a
b
+
b
2
Hint
5.
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.
25%
B.
0%
C.
75%
D.
50%
Hint