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Calculus 3 : Vector Subtraction

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Example Questions

Example Question #2310 : Calculus 3

Find the difference between the vectors $\left \langle 2,-3,6\right \rangle$ and $\left \langle -4,3,7\right \rangle$

Possible Answers:

$\left \langle 6,0,-1\right \rangle$

$\left \langle 6,-6,-1\right \rangle$

$\left \langle 6,-5,-1\right \rangle$

$\left \langle 3,-2,-1\right \rangle$

Correct answer:

$\left \langle 6,-6,-1\right \rangle$

Explanation:

To find the difference between two vectors $a=\left \langle a_1,a_2,a_3\right \rangle$ and $b=\left \langle b_1,b_2,b_3\right \rangle$ , we use the formula:

$a+b=\left \langle a_1-b_1,a_2-b_2,a_3-b_3\right \rangle$

Using the vectors from the problem statement, we get

$\left \langle 2+4,-3-3,6-7\right \rangle=\left \langle6,-6,-1 \right \rangle$

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Example Question #301 : Vectors And Vector Operations

Solve:

$\left \langle 3, 0, 12\right \rangle - \left \langle 2, -4, 3\right \rangle$

Possible Answers:

$\left \langle 1, -4, 9\right \rangle$

$\left \langle 1, 4, 9\right \rangle$

Correct answer:

$\left \langle 1, 4, 9\right \rangle$

Explanation:

To subtract two vectors, we must take the difference between the corresponding components (for example, $\left \langle a, b\right \rangle - \left \langle c, d\right \rangle= \left \langle a-c, b-d\right \rangle$ )

Our final answer is

$\left \langle 1, 4, 9\right \rangle$

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Example Question #301 : Vectors And Vector Operations

Find the difference between the vectors $\left \langle 3,3,4\right \rangle$ and $\left \langle -1,2,5\right \rangle$

Possible Answers:

$\left \langle 3,5,-1\right \rangle$

$\left \langle 4,0,-1\right \rangle$

$\left \langle 4,1,-1\right \rangle$

$\left \langle 4,1,6\right \rangle$

Correct answer:

$\left \langle 4,1,-1\right \rangle$

Explanation:

To find the difference between two vectors $a=\left \langle a_1,a_2,a_3\right \rangle$ and $b=\left \langle b_1,b_2,b_3\right \rangle$ , you use the formula

$a-b=\left \langle a_1-b_1,a_2-b_2,a_3-b_3\right \rangle$

Using the vectors from the problem statement, we get

$\left \langle 3+1,3-2,4-5\right \rangle=\left \langle 4,1,-1\right \rangle$

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Example Question #311 : Vectors And Vector Operations

Find the vector difference $\mathbf b - \mathbf a$ , where $\mathbf a = \left \langle 10,\sqrt{2},7 \right \rangle$ and $\mathbf b = \left \langle 5,-3,-6 \right \rangle$ .

Possible Answers:

$\left \langle 5,\sqrt{2}+3, 1\right \rangle$

$\left \langle -5,-3-\sqrt{2}, 13\right \rangle$

$\left \langle 5,\sqrt{2}+3, 13\right \rangle$

$\left \langle -5,-3-\sqrt{2}, -13\right \rangle$

$\left \langle -5,3-\sqrt{2}, -13\right \rangle$

Correct answer:

$\left \langle -5,-3-\sqrt{2}, -13\right \rangle$

Explanation:

If $\mathbf a = \left \langle a_1, a_2, a_3, ... , a_n\right \rangle$ and $\mathbf b = \left \langle b_1, b_2, b_3, ... , b_n\right \rangle$ , then the vector $\mathbf a - \mathbf b$ , called the "difference" of two vectors, is defined by the difference of its respective components; that is,

$\mathbf a - \mathbf b=\left \langle a_1-b_1, a_2-b_2, a_3-b_3, ... , a_n-b_n\right \rangle$ .

We have $\mathbf a = \left \langle 10,\sqrt{2},7 \right \rangle$ and $\mathbf b = \left \langle 5,-3,-6 \right \rangle$ . Since subtraction of real numbers is not commutative, and the difference of vectors is defined by the differences of the real numbers which comprise their components, $\mathbf a - \mathbf b \neq \mathbf b - \mathbf a$ unless $\mathbf a = \mathbf b$ . Therefore, we must careful with the order in which the vectors $\mathbf a$ and $\mathbf b$ are subtracted. We can calculate the vector $\mathbf b-\mathbf a$ using the definition of the "difference" of two vectors as follows:

$\mathbf b-\mathbf a =\left \langle (5)-(10), (-3)-(\sqrt{2}), (-6)-(7)\right \rangle$

$=\left \langle -5, -3-\sqrt{2}, -13\right \rangle$

Hence, $\mathbf b - \mathbf a = \left \langle -5, -3-\sqrt{2}, -13\right \rangle$ .

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Example Question #21 : Vector Subtraction

Solve:

$\left \langle 3, 2, -2\right \rangle - \left \langle -1, -4, 3\right \rangle$

Possible Answers:

$\left \langle 2, 6, -5\right \rangle$

$\left \langle 4, -2, -5\right \rangle$

$\left \langle 4, 6, -5\right \rangle$

Correct answer:

$\left \langle 4, 6, -5\right \rangle$

Explanation:

The difference of two vectors is found by subtracting the corresponding components (for instance, $\left \langle a, b\right \rangle - \left \langle c, d\right \rangle= \left \langle a-c, b-d\right \rangle$ )

Our final answer is

$\left \langle 4, 6, -5\right \rangle$

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Example Question #312 : Vectors And Vector Operations

Find the difference of the vectors $\left \langle -7,-2,-5\right \rangle$ and $\left \langle 0,-5,-4\right \rangle$

Possible Answers:

$\left \langle -7,2,-1\right \rangle$

$\left \langle -6,3,-1\right \rangle$

$\left \langle -7,3,-1\right \rangle$

$\left \langle -7,3,-3\right \rangle$

Correct answer:

$\left \langle -7,3,-1\right \rangle$

Explanation:

To find the difference between two vectors $a=\left \langle a_1,a_2,a_3\right \rangle$ and $b=\left \langle b_1,b_2,b_3\right \rangle$ , we use the formula

$a-b=\left \langle a_1-b_1,a_2-b_2,a_3-b_3\right \rangle$

Using the vectors from the problem statement we get

$\left \langle -7-0,-2+5,-5+4\right \rangle=\left \langle -7,3,-1\right \rangle$

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Example Question #314 : Vectors And Vector Operations

Find the difference of the vectors $\left \langle 1,-9,4\right \rangle$ and $\left \langle 0,-5,-4\right \rangle$

Possible Answers:

$\left \langle 1,-3,0\right \rangle$

$\left \langle 1,-4,8\right \rangle$

$\left \langle 1,-4,1\right \rangle$

$\left \langle 2,-4,0\right \rangle$

Correct answer:

$\left \langle 1,-4,8\right \rangle$

Explanation:

To find the difference between two vectors $a=\left \langle a_1,a_2,a_3\right \rangle$ and $b=\left \langle b_1,b_2,b_3\right \rangle$ , we use the formula

$a-b=\left \langle a_1-b_1,a_2-b_2,a_3-b_3\right \rangle$

Using the vectors from the problem statement we get

$\left \langle 1-0,-9+5,4+4\right \rangle=\left \langle 1,-4,8\right \rangle$

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Example Question #315 : Vectors And Vector Operations

Find the difference between the vectors $\left \langle 3x,2y,9z\right \rangle$ and $\left \langle 11x,7y,13z\right \rangle$

Possible Answers:

$\left \langle -8x,-5y,-4z\right \rangle$

$\left \langle -8x,-5y,4z\right \rangle$

$\left \langle -8,-5,-4\right \rangle$

$\left \langle -3x,-5y,-z\right \rangle$

Correct answer:

$\left \langle -8x,-5y,-4z\right \rangle$

Explanation:

To find the difference between two vectors $a=\left \langle a_1,a_2,a_3\right \rangle$ and $b=\left \langle b_1,b_2,b_3\right \rangle$ , we use the formula

$a-b=\left \langle a_1-b_1,a_2-b_2,a_3-b_3\right \rangle$

Using the vectors from the problem statement, we get

$\left \langle 3x-11x,2y-7y,9z-13z\right \rangle=\left \langle -8x,-5y,-4z\right \rangle$

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Calculus 3 : Vector Subtraction

Study concepts, example questions & explanations for Calculus 3

All Calculus 3 Resources

Example Questions

Example Question #2310 : Calculus 3

Example Question #301 : Vectors And Vector Operations

Example Question #301 : Vectors And Vector Operations

Example Question #311 : Vectors And Vector Operations

Example Question #21 : Vector Subtraction

Example Question #312 : Vectors And Vector Operations

Example Question #314 : Vectors And Vector Operations

Example Question #315 : Vectors And Vector Operations

All Calculus 3 Resources

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