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masha68 [24]
3 years ago
9

Please help me I don't understand

Mathematics
1 answer:
babymother [125]3 years ago
8 0
X • 2 + 30 = 3800
1885 • 2 + 30 = 3800
3770 + 30 = 3800
3800 = 3800

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Write the following quotient in the form a+bi.<br> -7i/2-7i
Helga [31]

Answer:

\large\boxed{\dfrac{49}{53}-\dfrac{14}{53}i}

Step-by-step explanation:

\text{Use}\\\\i=\sqrt{-1}\to i^2=-1\\\\(a-b)(a+b)=a^2-b^2\to(a-bi)(a+bi)=a^2+b^2\\\\\text{distributive property}\ a(b+c)=ab+ac\\---------------------\\\\\dfrac{-7i}{2-7i}=\dfrac{-7i}{2-7i}\cdot\dfrac{2+7i}{2+7i}=\dfrac{-7i(2+7i)}{2^2+7^2}=\dfrac{(-7i)(2)+(-7i)(7i)}{4+49}\\\\=\dfrac{-14i-49i^2}{53}=\dfrac{-14i-49(-1)}{53}=\dfrac{-14i+49}{53}\\\\=\dfrac{49}{53}-\dfrac{14}{53}i

8 0
3 years ago
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Pani-rosa [81]
Answer: 22

Work:
4 * 6 = 24
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5 0
2 years ago
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Can someone help me?<br> (A) 1.5<br> (B) 3<br> (C) 4.5<br> (D) 6
zhenek [66]

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6 0
3 years ago
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Which shows a function that is decreasing<br>over its entire graph? Working on it now need ASAP ​
PtichkaEL [24]

One thing everyone always forgets is we don't usually see the <em>entire</em> graph.  Once out of the frame, these functions can do anything they want.

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7 0
3 years ago
Which point is the vertex for the graph of y = |x| + 2?
Tasya [4]
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3 years ago
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