Question

What is the magnitude of the vector with an initial point of (1,-2) and a terminal point of (2,-5)?

So basically I've no idea how to find the magnitude? I know you're supposed to plot the points, I'm just not sure what to do next.

Answer 1

please, you have to find the length of the segment joining your two points. So, first calculate the distance between your points, using the forula of the distance, namely:
\[d=\sqrt{(x _{2}-x _{1})^{2}+(y _{2}-y _{1})^{2}}\],where x_1,x_2, y_1, y_2, are the coordinates of your points, try please, and write your result

Answer 2

@oswin \[d=\sqrt{(2-1)^{2}+(-5-(-2))^{2}}=...\]
d is your magnitude

Answer 3

So d =-2? @Michele_Laino

Answer 4

please, note that d is a positive number, retry please!

Answer 5

Every way I try it, I get a negative number... All I'm doing is the operations... What am I missing?

Answer 6

(2-1)^2=1^1=1 is right?

Answer 7

\[(2-1)^{2}=1^{2}=1\]

Answer 8

Hold on, I messed up. The answer would be \[2isqrt{2}\]

Answer 9

\[2i \sqrt{2}\]

Answer 10

There we go :P

Answer 11

please note d must be real, because you can measure it,
\[(-5-(2))^{2}=(-5+2)^{2}=3^{2}=9\]

Answer 12

@oswin so d=sqrt(1+9)=...

Answer 13

So D=10?

Answer 14

please, note taht there is a square root

Answer 15

\[\sqrt{10}\]

Answer 16

that's right!

Answer 17

Yaaaayyy! Thank you :)

Answer 18

thank you!

Answer 19

Four students were asked to write an expression which has terms that have a greatest common factor of 8c.

Answer 20

hey kids. im leaving questioncove forever.

Answer 21

Which value must be added to the expression x2 u2013 3x to make it a perfect-square trinomial?
mc004-1.

Answer 22

Which expression is a quadratic binomial?
mc005-1.jpg
mc005-2.jpg
mc005-3.jpg
mc005-4.

Answer 23

Use synthetic division to solve mc005-1.jpg. What is the quotient?
mc005-2.jpg
mc005-3.

Answer 24

The polynomial function f(x) is a fourth degree polynomial. Which of the following could be the complete list of the roots of f(x)?
3, 4, 5, 6
3, 4, 5, 6i
3

Answer 25

A geometric sequence is defined recursively by an = 5an-1. The first term of the sequence is 0.

Answer 26

Which statement is true? Check all that apply.
A.Volume is the amount of space inside an object.

Answer 27

Jade has $451.89 in her checking account. After 3 checks, each for the same amount, are deducted from her account, she has $358.

Answer 28

The school record in the 200-meter dash is 34.5 seconds. Which graph represents t

Answer 29

Khaleem wanted to draw a triangle where the sides measured 5 cm, 8 cm, and 7 cm.

Answer 30

What shapes can the composite figure be decomposed into? Check all that apply.

A.

Answer 31

What is the other dimension of the rectangular cross section that is perpendicula

Answer 32

What rhetorical device is used in this excerpt from Mark Twain's "The Danger of L

Answer 33

Given that u2220ABC u2245 u2220DBE, which statement must be true

Answer 34

When Olivia meets Sebastian again, she brings a priest with her and asks Sebastian to "Plight [her] the full assurance of [his] faith.

Answer 35

Fre shavocado

Answer 36

Percent of change.

Answer 37

What is the meaning of the idiom "to swallow something hook, line, and sinker"?

A.