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Dmitry [639]
2 years ago
8

Find the sum of (–4 + i) and (10 – 5i). –3 + 5i –3 – 5i 6 – 4i 6 – 6i

Mathematics
2 answers:
MaRussiya [10]2 years ago
8 0

Answer:

The answer is 6 – 4i

Step-by-step explanation:

Complex values:

Have the following format: a + bi

In which a is the real part and b is the complex part.

Addition:

Suppose we are going to add two complex numbers. We add their real parts, and their complex parts separatly.

So

(–4 + i) + (10 – 5i) = (-4 + 10) + i(1-5) = 6 - 4i

The answer is 6 – 4i

Andreyy892 years ago
3 0

Answer:

c, 6-4i

Step-by-step explanation:

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Consider the function f(x)= 2/5x-4
Gre4nikov [31]

Answer: a) \frac{5}{2}x+10=f^{-1}(x)=g(x)

Step-by-step explanation:

Since we have given that

f(x)=\frac{2}{5}x-4

a.) Find the inverse of f(x) and name it g(x).

Let f(x) = y

So, it becomes

y=\frac{2}{5}x-4

Switching x to y , we get

x=\frac{2}{5}y-4

5x=2y-20\\\\5x+20=2y\\\\\frac{5x+20}{2}=y\\\\\frac{5}{2}x+10=y\\\\\frac{5}{2}x+10=f^{-1}(x)=g(x)

b) . Use composition to show that f(x) and g(x) are inverses of each other.

\mathrm{For}\:f=\frac{2}{5}x-4\:\\\\\mathrm{substitute}\:x\:\mathrm{with}\:g\left(x\right)=\frac{5}{2}x+10\\\\=\frac{2}{5}\left(\frac{5}{2}x+10\right)-4\\\\=x

Similarly,

\mathrm{g\left(x\right)=\frac{5}{2}x+10,\:f\left(x\right)=\frac{2}{5}x-4,\:g\left(x\right)\circ \:f\left(x\right)}\\\\\mathrm{For}\:g=\frac{5}{2}x+10\:\mathrm{substitute}\:x\:\mathrm{with}\:f\left(x\right)=\frac{2}{5}x-4\\\\=\frac{5}{2}\left(\frac{2}{5}x-4\right)+10\\\\=x

so, both are inverses of each other.

c) Draw the graphs of f(x) and g(x) on the same coordinate plane.

As shown below in the graph , Since for inverse function we need an axis of symmetry i.e. y=x

And both f(x) and g(x) are symmetry to y=x.

∴ f(x) and g(x) are inverses of each other.


5 0
3 years ago
La sucesión {1/ n } es convergente <br><br> alguien me ayuda por favor
loris [4]

Answer:

si es convergente

más inteligente por favor

Step-by-step explanation:

7 0
2 years ago
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patriot [66]
In Sunday she babysits 1 hour and 23 minutes,in Saturday she babysit 1 hour and 39 minutes.In total it’s 3 hours and 12 minutes.
4 0
2 years ago
Which expression shows twice the sum of 8 and a number n?
IRISSAK [1]
Correct Answer: A. 2(n+8).
6 0
3 years ago
Please help! i need to find the mean
irina1246 [14]

Answer:

<h3>          The mean is 3.74</h3>

Step-by-step explanation:

\overline x =\dfrac{-3\cdot4+(-2)\cdot2+3\cdot1+4\cdot1+6\cdot4+8\cdot7}{4+2+1+1+4+7}\\\\\\\overline x =\dfrac{-12-4+3+4+24+56}{19}\\\\\\\overline x =\dfrac{71}{19}=3.7368421....\approx3.74

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3 years ago
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