Question

Find the unit vector in the direction of u, and write your answer in component form. Let u = <-8, -9>. Find 7u.

Answer 1

Please help !!

Answer 2

@amistre64 please help

Answer 3

@phi
@ganeshie8 please help

Answer 4

do you know how to find the magnitude of u?

Answer 5

@Andreshoyos23 ?

Answer 6

no

Answer 7

but i belive i figured it out @zzr0ck3r

Answer 8

if you have a vector (a,b)
then the magnitude is
\[\sqrt{a^2+b^2}\]

Answer 9

is it <-56, -63>

Answer 10

that is the answer to the second part

Answer 11

but the first part wants you to find the unit vector

Answer 12

the magnitude is squared and rooted?

Answer 13

meaning if i have the two numbers -8 and -9 you must square and muliply by two

Answer 14

\[given \space <a,b>\\\text{then the unit vector is}\\\frac{1}{\sqrt{a^2+b^2}}*<a,b>=<\frac{a}{\sqrt{a^2+b^2}},\frac{b}{\sqrt{a^2+b^2}}>\]

Answer 15

ah !!!! ok :D i see