Multiply Factored Expressions
International Brotherhood of Electrical Workers Exam IBEW · Flashcards
INTERNATIONAL BROTHERHOOD OF ELECTRICAL WORKERS EXAM IBEW · FLASHCARDS
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QUESTION
What is the product when you expand
(
2
x
+
1
)
(
x
+
4
)
(2x+1)(x+4)
(
2
x
+
1
)
(
x
+
4
)
?
QUESTION
What is the product when you expand
(
x
−
3
)
(
x
2
+
3
x
+
9
)
(x-3)(x^2+3x+9)
(
x
−
3
)
(
x
2
+
3
x
+
9
)
?
QUESTION
What is the product when you expand
(
3
x
+
2
)
2
(3x+2)^2
(
3
x
+
2
)
2
?
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ANSWER
9
x
2
+
12
x
+
4
9x^2+12x+4
9
x
2
+
12
x
+
4
. Applies the binomial square pattern
(
a
+
b
)
2
=
a
2
+
2
a
b
+
b
2
(a+b)^2 = a^2 + 2ab + b^2
(
a
+
b
)
2
=
a
2
+
2
ab
+
b
2
, with
a
=
3
x
a=3x
a
=
3
x
and
b
=
2
b=2
b
=
2
.
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