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Westkost [7]
3 years ago
9

Factor and then solve the question. X^2-6X=7​

Mathematics
1 answer:
lukranit [14]3 years ago
3 0

Answer:

The solution set is {-1, 7}.

Step-by-step explanation:

X^2-6X=7​

X^2 - 6X - 7​ = 0

(X - 7)(X + 1) = 0

X = 7, -1.

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Find z1z2 if z1 = 2/5(cos63° + isin63°) and z2 = 10/3(cos117° + isin117°).
Airida [17]

Answer:

-10/3 is the answer

Step-by-step explanation:

Given are two complex numbers as

z1=\frac{2}{5} (cos63  + isin63)\\z2=\frac{10}{3} (cos 117 + isin117})

Recall Demoivre theorem as

(cosA+isinA)(cos A+isin B) = cos(A+B)+isin(A+B)

Hence here we have sum of angles  as

A+B = 63+117 =180

z1z2=\frac{2}{5} \frac{10}{3} (cos180+isin180)

=\frac{-10}{3}

Since sin180=0 and cos 180=-1

7 0
3 years ago
Use the method of completing the square to transform the quadratic equation into the equation form (x + p)2 = q. 3 + x - 3x2 = 9
Triss [41]
To <span>transform the quadratic equation into the equation form (x + p)2 = q we shall proceed as follows:
3+x-3x^2=9
putting like terms together we have:
-3x^2+x=6
dividing through by -3 we get:
x^2-x/3=-2
but
c=(b/2a)^2
c=(-1/6)^2=1/36
thus the expression will be:
x^2-x/3+1/36=-2+1/36
1/36(6x-1)</span>²=-71/36

the answer is:
1/36(6x-1)²=-71/36
7 0
3 years ago
Marking brainliest
Ede4ka [16]

36%

Hope this is right im only 11  :)

8 0
3 years ago
Kelvin and Lewie each design surveys in order to determine the number of people who buy food at the mall. Kelvin surveys every o
timurjin [86]

Answer: A.Kelvin’s because he surveyed people leaving an area where food is sold


Step-by-step explanation:

Given: Kelvin and Lewie each design surveys in order to determine the number of people who buy food at the mall.

Kelvin surveys every other person leaving the food area.

Thus, he doesn't know about the people who do not buy food at mall whereas Lewie surveys every fifth person leaving the mall’s main entrance.

Thus, by this systematic random sampling he knows out of how many people the number of people buy food at mall.

Hence, Kelvin’s survey is likely to produce less valid results because he surveyed people leaving an area where food is sold.

6 0
3 years ago
Read 2 more answers
A project can be completed by 5 workers in 24 days. How many workers are needed to finish the project in 15 days? The time to co
victus00 [196]

8

Step-by-step explanation:

5×4 equals 120 120 divided by 15 equals 8 which is the answer

8 0
2 years ago
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