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Calculus 3 : Dot Product

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Example Questions

Example Question #2475 : Calculus 3

Find the dot product between the vectors $\left \langle 2,0,8\right \rangle$ and $\left \langle 1,-4,2\right \rangle$

Possible Answers:

Correct answer:

Explanation:

To find the dot product between two vectors $a=\left \langle x_1,y_1,z_1\right \rangle$ and $b=\left \langle x_2,y_2,z_2\right \rangle$ , we apply the formula

$a\cdot b=(x_1*x_2)+(y_1*y_2)+(z_1*z_2)$

Using the vectors from the problem statement, we get

(2*1)+(0*-4)+(8*2)=18

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Example Question #471 : Vectors And Vector Operations

Find the dot product between the vectors $\left \langle -7,-1,0\right \rangle$ and $\left \langle 2,3,0\right \rangle$

Possible Answers:

Correct answer:

Explanation:

To find the dot product between two vectors $a=\left \langle x_1,y_1,z_1\right \rangle$ and $b=\left \langle x_2,y_2,z_2\right \rangle$ , we apply the following formula:
$a\cdot b=(x_1*x_2)+(y_1*y_2)+(z_1*z_2)$

Using the vectors from the problem statement, we get

(-7*2)+(-1*3)+(0*0)=-17

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Example Question #472 : Vectors And Vector Operations

Find the dot product between the vectors $\left \langle -8,-2,1\right \rangle$ and $\left \langle 5,3,1 \right \rangle$

Possible Answers:

Correct answer:

Explanation:

Using the vectors from the problem statement, we get

(-8*5)+(-2*3)+(1*1)=-45

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Example Question #471 : Vectors And Vector Operations

Find the dot product between the vectors $\left \langle 2,14,1\right \rangle$ and $\left \langle -5,0,9\right \rangle$

Possible Answers:

Correct answer:

Explanation:

To find the dot product between the 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:

$a\cdot b=(a_1b_1)+(a_2b_2)+(a_3b_3)$

Using the vectors from the problem statement and applying, we get

(2*-5)+(14*0)+(1*9)=-1

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Example Question #472 : Vectors And Vector Operations

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

Possible Answers:

Correct answer:

Explanation:

To find the dot product between the 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:

$a\cdot b=(a_1b_1)+(a_2b_2)+(a_3b_3)$

Using the vectors from the problem statement and applying, we get

(2*4)+(5*-1)+(-3*1)=0

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Example Question #161 : Dot Product

Find the dot product between the vectors $\left \langle -1,7,-2\right \rangle$ and $\left \langle 6,1,5\right \rangle$

Possible Answers:

Correct answer:

Explanation:

To find the dot product between the 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:

$a\cdot b=(a_1b_1)+(a_2b_2)+(a_3b_3)$

Using the vectors from the problem statement and applying, we get

(-1*6)+(7*1)+(-2*5)=-9

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Example Question #162 : Dot Product

Find the dot product between the vectors $\left \langle -5,0,2\right \rangle$ and $\left \langle 10,2,7\right \rangle$

Possible Answers:

Correct answer:

Explanation:

To find the dot product 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 apply the formula:

$a\cdot b=a_1b_1+a_2b_2+a_3b_3$

Using the vectors from the problem statement, we get

(-5*10)+(0*2)+(2*7)=-36

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Example Question #163 : Dot Product

Find the dot product between the vectors $\left \langle -4,-3,6\right \rangle$ and $\left \langle 2,7,-1\right \rangle$

Possible Answers:

Correct answer:

Explanation:

To find the dot product 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 apply the formula:

$a\cdot b=a_1b_1+a_2b_2+a_3b_3$

Using the vectors from the problem statement, we get

(-4*2)+(-3*7)+(6*-1)=-35

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Example Question #161 : Dot Product

Solve:

$\left \langle -5, 4, 2\right \rangle \cdot \left \langle 2x, xy, z^3\right \rangle$

Possible Answers:

$\left \langle -10x,4xy,2z^3 \right \rangle$

-10x+4xy+2z^3

10x+4xy+2z^3

-80x^2yz^3

Correct answer:

-10x+4xy+2z^3

Explanation:

The dot product is given by the sum of the products of the corresponding components of each vector (for example, $\left \langle a,b\right \rangle\cdot \left \langle x,y\right \rangle= ax+by$ )

Our final answer is

-10x+4xy+2z^3

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Example Question #162 : Dot Product

Solve for x:

$\left \langle x, 2x, 5\right \rangle \cdot \left \langle 3, 1, 0\right \rangle =4$

Possible Answers:

x=0

$x=\frac{1}{5}$

$x=\frac{4}{5}$

$x=\frac{5}{4}$

Correct answer:

$x=\frac{4}{5}$

Explanation:

To solve for x, we must take the dot product, which is performed by multiplying the corresponding components and adding the products together.

We get

3x+2x+0=4

Solving for x, we get

5x=4

$x=\frac{4}{5}$

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Calculus 3 : Dot Product

Study concepts, example questions & explanations for Calculus 3

All Calculus 3 Resources

Example Questions

Example Question #2475 : Calculus 3

Example Question #471 : Vectors And Vector Operations

Example Question #472 : Vectors And Vector Operations

Example Question #471 : Vectors And Vector Operations

Example Question #472 : Vectors And Vector Operations

Example Question #161 : Dot Product

Example Question #162 : Dot Product

Example Question #163 : Dot Product

Example Question #161 : Dot Product

Example Question #162 : Dot Product

All Calculus 3 Resources

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