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Blizzard [7]
3 years ago
10

Help me with this one please.

Mathematics
1 answer:
kvasek [131]3 years ago
8 0
I think you need to figure it out to 3. if you dont it wont make sense until you figure it out. maybe do what you know. you are given the first two answers. then you figure out how to prove it.
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Determine if this is a linearly dependent or independent set: (V, V, V ) where syon V = (1,2,2,-1), V = (4,9,9,-4), v = (5,8,9,-
marishachu [46]

Answer:

This is a linearly independent set.

Step-by-step explanation:

We have these following vectors:

V_{1} = (1,2,2,-1)

V_{2} = (4,9,9,-4)

V_{3} = (5,8,9,-5)

In a set of 3 vectors, if one of these vectors can be written as a linear combination of the 2 other vectors, they are linearly dependent. Otherwise, they are linearly independent.

We can verify this by solving the following system:

xV_{1} + yV_{2} + zV_{3} = (0,0,0,0)

If the only solution is (x,y,z) = (0,0,0), they are L.I. Otherwise, they are L.D.

Solution:

xV_{1} + yV_{2} + zV_{3} = (0,0,0,0)

x(1,2,2,-1) + y(4,9,9,-4) + z (5,8,9,-5) = (0,0,0,0)

We have the following system of equations:

x + 4y + 5z = 0

2x + 9y + 8z = 0

2x + 9y + 9z = 0

-x -4y - 5z = 0

I am going to solve this by the row-reduction of the augmented matrix.

This system has the following augmented matrix:

\left[\begin{array}{cccc}1&4&5&0\\2&9&8&0\\2&9&9&0\\-1&-4&-5&0\end{array}\right]

To reduce the first row, i am going to make these following operations:

L_{2} = L_{2} - 2L_{1}

L_{3} = L_{3} - 3L_{1}

L_{4} = L_{4} + L_{1}

So the augmented matrix now is:

\left[\begin{array}{cccc}1&4&5&0\\0&1&-2&0\\0&1&-1&0\\0&0&0&0\end{array}\right]

Now I reduce the second row, doing:

L_{3} = L_{3} - L_{2}

So the matrix is:

\left[\begin{array}{cccc}1&4&5&0\\0&1&-2&0\\0&0&1&0\\0&0&0&0\end{array}\right]

Now we can solve the system:

From the third line, we have that

z = 0

From the second line:

y - 2z = 0

y - 2(0) = 0

y = 0

From the first line

x + 4y + 5z = 0

x + 4(0) + 5(0) = 0

x = 0

The only solution for this system is (x,y,z) = (0,0,0). This means that we have a linearly independent set.

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3 years ago
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82 cubic feet is the answer

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I dont understand please help​
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What is the question?

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