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Let’s check out your problem:
Express the radical using the imaginary unit,
i
i
i
.
\newline
Express your answer in simplified form.
\newline
±
−
72
=
±
□
\pm \sqrt{-72}= \pm \square
±
−
72
=
±
□
View step-by-step help
Home
Math Problems
Algebra 2
Introduction to complex numbers
Full solution
Q.
Express the radical using the imaginary unit,
i
i
i
.
\newline
Express your answer in simplified form.
\newline
±
−
72
=
±
□
\pm \sqrt{-72}= \pm \square
±
−
72
=
±
□
Expressing
−
72
\sqrt{-72}
−
72
:
First, we need to express
±
−
72
\pm\sqrt{-72}
±
−
72
as the product of the
square root
of a positive number and the square root of
−
1
-1
−
1
.
\newline
±
−
72
=
±
−
1
×
72
\pm\sqrt{-72} = \pm\sqrt{-1 \times 72}
±
−
72
=
±
−
1
×
72
Recognizing
−
1
\sqrt{-1}
−
1
:
Next, we recognize that
−
1
\sqrt{-1}
−
1
is the definition of the imaginary unit
i
i
i
.
±
−
1
⋅
72
=
±
−
1
⋅
72
=
±
i
⋅
72
\pm\sqrt{-1 \cdot 72} = \pm\sqrt{-1} \cdot \sqrt{72} = \pm i \cdot \sqrt{72}
±
−
1
⋅
72
=
±
−
1
⋅
72
=
±
i
⋅
72
Simplifying
72
\sqrt{72}
72
:
Now, we simplify
72
\sqrt{72}
72
. Since
72
72
72
is
36
36
36
times
2
2
2
and
36
36
36
is a perfect square, we can simplify further.
\newline
72
=
36
×
2
=
36
×
2
=
6
×
2
\sqrt{72} = \sqrt{36 \times 2} = \sqrt{36} \times \sqrt{2} = 6 \times \sqrt{2}
72
=
36
×
2
=
36
×
2
=
6
×
2
Multiplying by the imaginary unit i:
Finally, we multiply the simplified square root by the imaginary unit i.
\newline
±
i
⋅
72
=
±
i
⋅
6
⋅
2
=
±
6
i
⋅
2
\pm i \cdot \sqrt{72} = \pm i \cdot 6 \cdot \sqrt{2} = \pm 6i \cdot \sqrt{2}
±
i
⋅
72
=
±
i
⋅
6
⋅
2
=
±
6
i
⋅
2
More problems from Introduction to complex numbers
Question
What is the period of
y
=
3
cos
(
x
−
7
)
+
2
y=3 \cos (x-7)+2
y
=
3
cos
(
x
−
7
)
+
2
?
\newline
Give an exact value.
\newline
units
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Posted 10 months ago
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(
−
10
i
)
+
(
−
40
+
8
i
)
=
(-10 i)+(-40+8 i)=
(
−
10
i
)
+
(
−
40
+
8
i
)
=
\newline
Express your answer in the form
(
a
+
b
i
)
(a+b i)
(
a
+
bi
)
.
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Posted 10 months ago
Question
(
8
−
i
)
−
(
−
82
+
2
i
)
=
(8-i)-(-82+2 i)=
(
8
−
i
)
−
(
−
82
+
2
i
)
=
\newline
Express your answer in the form
(
a
+
b
i
)
(a+b i)
(
a
+
bi
)
.
Get tutor help
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Question
(
80
i
)
−
(
80
+
10
i
)
=
(80 i)-(80+10 i)=
(
80
i
)
−
(
80
+
10
i
)
=
\newline
Express your answer in the form
(
a
+
b
i
)
(a+b i)
(
a
+
bi
)
.
Get tutor help
Posted 10 months ago
Question
Express the radical using the imaginary unit,
i
i
i
.
\newline
Express your answer in simplified form.
\newline
±
−
64
=
±
\pm \sqrt{-64}= \pm
±
−
64
=
±
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Posted 10 months ago
Question
Which of the following is equivalent to the complex number
i
21
i^{21}
i
21
?
\newline
Choose
1
1
1
answer:
\newline
(A)
1
1
1
\newline
(B)
i
i
i
\newline
(C)
−
1
-1
−
1
\newline
(D)
−
i
-i
−
i
Get tutor help
Posted 10 months ago
Question
Express the radical using the imaginary unit,
i
i
i
.
\newline
Express your answer in simplified form.
\newline
±
−
30
=
±
\pm \sqrt{-30}= \pm
±
−
30
=
±
Get tutor help
Posted 10 months ago
Question
Express the radical using the imaginary unit,
i
i
i
.
\newline
Express your answer in simplified form.
\newline
±
−
35
=
±
\pm \sqrt{-35}= \pm
±
−
35
=
±
Get tutor help
Posted 10 months ago
Question
Express the radical using the imaginary unit,
i
i
i
.
\newline
Express your answer in simplified form.
\newline
±
−
80
=
±
\pm \sqrt{-80}= \pm
±
−
80
=
±
Get tutor help
Posted 10 months ago
Question
Express the radical using the imaginary unit,
i
i
i
.
\newline
Express your answer in simplified form.
\newline
±
−
4
=
±
\pm \sqrt{-4}= \pm
±
−
4
=
±
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Posted 10 months ago
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