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jesuslovesu
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Span of vectors in R3
u1 = (1,0,-1)
u2 = (1,1,1)
u3 = (3,1,-1)
Determine whether the vectors span R^3.
I know how to determine if the vectors span R^3(or maybe i dont). In this case checking if I can find a linear combo for (1,0,0)
Step 1:
1 = a + b + 3c
0 = 0 + b + c
0 = -a + b - c
Step 2:
b = -c
Step 3:
1 = a - c + 3c
1 = a + 2c
Step 4:
a = b -c
a = -2c
Step 5:
1 = (-2c) + 2c
1 = 0
Now with 1 = 0, I would think that the linear system of equations cannot be solved.
**Solving this problem with my graphing calculator I get the same answer, however my book states that these three vectors do indeed span R^3. Why is that?
Homework Statement
u1 = (1,0,-1)
u2 = (1,1,1)
u3 = (3,1,-1)
Determine whether the vectors span R^3.
Homework Equations
The Attempt at a Solution
I know how to determine if the vectors span R^3(or maybe i dont). In this case checking if I can find a linear combo for (1,0,0)
Step 1:
1 = a + b + 3c
0 = 0 + b + c
0 = -a + b - c
Step 2:
b = -c
Step 3:
1 = a - c + 3c
1 = a + 2c
Step 4:
a = b -c
a = -2c
Step 5:
1 = (-2c) + 2c
1 = 0
Now with 1 = 0, I would think that the linear system of equations cannot be solved.
**Solving this problem with my graphing calculator I get the same answer, however my book states that these three vectors do indeed span R^3. Why is that?
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