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Let’s check out your problem:
Multiply and simplify the following complex numbers:
\newline
(
5
−
5
i
)
⋅
(
−
3
+
5
i
)
(5-5 i) \cdot(-3+5 i)
(
5
−
5
i
)
⋅
(
−
3
+
5
i
)
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Math Problems
Grade 8
Multiply numbers written in scientific notation
Full solution
Q.
Multiply and simplify the following complex numbers:
\newline
(
5
−
5
i
)
⋅
(
−
3
+
5
i
)
(5-5 i) \cdot(-3+5 i)
(
5
−
5
i
)
⋅
(
−
3
+
5
i
)
Distribute terms:
Distribute each term in the first complex number by each term in the second complex number.
\newline
(
5
−
5
i
)
(
−
3
+
5
i
)
=
5
(
−
3
)
+
5
(
5
i
)
−
5
i
(
−
3
)
−
5
i
(
5
i
)
(5-5i)(-3+5i) = 5(-3) + 5(5i) - 5i(-3) - 5i(5i)
(
5
−
5
i
)
(
−
3
+
5
i
)
=
5
(
−
3
)
+
5
(
5
i
)
−
5
i
(
−
3
)
−
5
i
(
5
i
)
Multiply terms:
Multiply the terms.
\newline
5
⋅
(
−
3
)
=
−
15
5 \cdot (-3) = -15
5
⋅
(
−
3
)
=
−
15
\newline
5
⋅
(
5
i
)
=
25
i
5 \cdot (5i) = 25i
5
⋅
(
5
i
)
=
25
i
\newline
−
5
i
⋅
(
−
3
)
=
15
i
-5i \cdot (-3) = 15i
−
5
i
⋅
(
−
3
)
=
15
i
\newline
−
5
i
⋅
(
5
i
)
=
−
25
i
2
-5i \cdot (5i) = -25i^2
−
5
i
⋅
(
5
i
)
=
−
25
i
2
Combine like terms:
Combine like terms and remember that
i
2
=
−
1
i^2 = -1
i
2
=
−
1
.
\newline
−
15
+
25
i
+
15
i
−
25
(
−
1
)
-15 + 25i + 15i - 25(-1)
−
15
+
25
i
+
15
i
−
25
(
−
1
)
Simplify expression:
Simplify the expression.
−
15
+
40
i
+
25
-15 + 40i + 25
−
15
+
40
i
+
25
Combine real and imaginary parts:
Combine the real parts and the imaginary parts.
\newline
(
25
−
15
)
+
40
i
(25 - 15) + 40i
(
25
−
15
)
+
40
i
Finish simplifying:
Finish simplifying by adding the real numbers together.
\newline
25
−
15
=
10
25 - 15 = 10
25
−
15
=
10
\newline
So, the final answer is
10
+
40
i
10 + 40i
10
+
40
i
.
More problems from Multiply numbers written in scientific notation
Question
Multiply and simplify the following complex numbers:
\newline
(
4
+
4
i
)
⋅
(
−
2
−
5
i
)
(4+4 i) \cdot(-2-5 i)
(
4
+
4
i
)
⋅
(
−
2
−
5
i
)
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Multiply and simplify the following complex numbers:
\newline
(
3
−
4
i
)
⋅
(
−
3
+
2
i
)
(3-4 i) \cdot(-3+2 i)
(
3
−
4
i
)
⋅
(
−
3
+
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i
)
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Question
Multiply and simplify the following complex numbers:
\newline
(
5
+
2
i
)
⋅
(
−
5
−
i
)
(5+2 i) \cdot(-5-i)
(
5
+
2
i
)
⋅
(
−
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−
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)
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Posted 1 year ago
Question
Find
lim
x
→
4
x
−
4
3
−
x
+
5
\lim _{x \rightarrow 4} \frac{x-4}{3-\sqrt{x+5}}
lim
x
→
4
3
−
x
+
5
x
−
4
.
\newline
Choose
1
1
1
answer:
\newline
(A)
−
6
-6
−
6
\newline
(B)
−
4
3
-\frac{4}{3}
−
3
4
\newline
(C)
−
10
3
-\frac{10}{3}
−
3
10
\newline
D The limit doesn't exist
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Posted 1 year ago
Question
Consider the following problem:
\newline
The population of ants in Chloe's ant farm changes at a rate of
r
(
t
)
=
−
15.8
⋅
0.
9
t
r(t)=-15.8 \cdot 0.9^{t}
r
(
t
)
=
−
15.8
⋅
0.
9
t
ants per month (where
t
t
t
is time in months). At time
t
=
0
t=0
t
=
0
, the ant farm's population is
150
150
150
ants. How many ants are in the farm at
t
=
4
t=4
t
=
4
?
\newline
Which expression can we use to solve the problem?
\newline
Choose
1
1
1
answer:
\newline
(A)
∫
0
4
r
(
t
)
d
t
\int_{0}^{4} r(t) d t
∫
0
4
r
(
t
)
d
t
\newline
(B)
∫
3
4
r
(
t
)
d
t
\int_{3}^{4} r(t) d t
∫
3
4
r
(
t
)
d
t
\newline
(C)
150
+
∫
3
4
r
(
t
)
d
t
150+\int_{3}^{4} r(t) d t
150
+
∫
3
4
r
(
t
)
d
t
\newline
(D)
150
+
∫
0
4
r
(
t
)
d
t
150+\int_{0}^{4} r(t) d t
150
+
∫
0
4
r
(
t
)
d
t
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Posted 1 year ago
Question
Solved:
\newline
Integrate
3
1
+
x
2
\frac{3}{1+x^2}
1
+
x
2
3
for a limit
[
0
,
1
]
[0,1]
[
0
,
1
]
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Posted 1 year ago
Question
Which sign makes the statement true?
\newline
4.40
×
1
0
5
4.40 \times 10^5
4.40
×
1
0
5
?
\text{?}
?
4.40
×
1
0
4
4.40 \times 10^4
4.40
×
1
0
4
\newline
Choices:
\newline
(A)
>
>
>
\newline
(B)
<
<
<
\newline
(C)
=
=
=
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Posted 1 year ago
Question
Which sign makes the statement true?
\newline
7.19
×
1
0
2
7.19 \times 10^2
7.19
×
1
0
2
?
\text{?}
?
7.19
×
1
0
3
7.19 \times 10^3
7.19
×
1
0
3
\newline
Choices:
\newline
(A)
>
>
>
\newline
(B)
<
<
<
\newline
(C)
=
=
=
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Posted 1 year ago
Question
Which sign makes the statement true?
\newline
6
,
400
?
6.4
×
1
0
5
6,400 \, ? \, 6.4 \times 10^5
6
,
400
?
6.4
×
1
0
5
\newline
Choices:
\newline
(A)
>
>
>
\newline
(B)
<
<
<
\newline
(C)
=
=
=
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Question
You pick a card at random, put it back, and then pick another card at random.
\newline
4
4
4
\newline
5
5
5
\newline
6
6
6
\newline
7
7
7
\newline
What is the probability of picking a number greater than
5
5
5
and then picking a
4
4
4
?
\newline
Write your answer as a percentage.
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