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Mathematics
Mathematics
Problem
Working with Variables. a. Expand the product
9
(
3
x
+
7
)
9(3x + 7)
9
(
3
x
+
7
)
. b. Simplify
7
a
−
5
b
+
3
(
6
a
+
b
)
7a - 5b + 3(6a + b)
7
a
−
5
b
+
3
(
6
a
+
b
)
. c. Simplify
a
−
(
−
7
a
−
3
)
a - (-7a - 3)
a
−
(
−
7
a
−
3
)
. d. Simplify
3
(
5
−
2
r
)
−
2
(
−
3
r
+
1
)
3(5 - 2r) - 2(-3r + 1)
3
(
5
−
2
r
)
−
2
(
−
3
r
+
1
)
.
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