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AnnZ [28]
2 years ago
15

Which of the following is a solution of x2 + 2x = −2? (1 point)

Mathematics
1 answer:
geniusboy [140]2 years ago
7 0
X^2 + 2x = -2
x^2 + 2x + 2 = 0

x= \frac{-b\pm \sqrt{b^2-4ac} }{2a} \\x=\frac{-2\pm \sqrt{2^2-(4\times1\times2)} }{2\times1}\\x=\frac{-2\pm \sqrt{4-8} }{2}\\x=\frac{-2\pm \sqrt{-4} }{2}\\x=\frac{-2\pm2i }{2}\\x=-1\pm i

Therefore, x = -1 + i or x = -1 - i

Therefore, the correct answer is the third option.
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Please help will give brainliest.
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8 0
2 years ago
Find a vector equation and parametric equations for the line. (Use the parameter t.) The line through the point (0, 15, −6) and
Len [333]

<x = 0 + 2t, y = 15 - 3t, z = -6 + 7t> is the vector parametric equation of the line parallel to the given one and that passes through the point (0, 15, −6).

According to the statement

we have to find that the vector equation with the help of the given line equation and the points.

So, For this purpose, we know that the

A vector equation is an equation involving a linear combination of vectors with possibly unknown coefficients.

And the given points is (0, 15, −6) and the lines

x = −1 + 2t,

y = 6 − 3t,

z = 3 + 7t

From these equation of lines:

Let a = -1 and b = 6 and c = 3

Then

Now, if we want this line to pass through the point (0, 15, -6), then we can replace the correspondent values in the constant term for each equation:

So, Put it in the given equations then

x = 0 + 2t and y = 15 - 3t and z = -6 + 7t

and the vector equation become

<x = 0 + 2t, y = 15 - 3t, z = -6 + 7t>

So, <x = 0 + 2t, y = 15 - 3t, z = -6 + 7t> is the vector parametric equation of the line parallel to the given one and that passes through the point (0, 15, −6).

Learn more about vector parametric equation here

brainly.com/question/17088529

#SPJ4

7 0
1 year ago
Why do the comments on brainly keep getting deleted?
julia-pushkina [17]
When the limit of sentences get exceeded in the comments it one by one starts to delete...
8 0
2 years ago
Read 2 more answers
Which rate gives the best price. 10 sheets for 2 dollars , 6 sheets for 0.60¢, 3 sheets for 0.60¢ or 5 sheets for 1 dollar SHOW
pav-90 [236]
10 sheets for a $2 means each costs $0.20
6 sheets for $0.60 means each costs $0.10
3 sheets for $0.60 means each costs $0.20
5 sheets for $1 means each sheet costs $0.20
So the answer is 6 sheets for $0.60 since that is the cheapest amount.
Hope this helps! Let me know if you need any further assistance!
4 0
3 years ago
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