Find the unit vector in the direction of u, and write your answer in component form. Let u = . Find 7u.

Question

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

anonymous · Answer

Please help !!

anonymous · Answer

@amistre64 please help

anonymous · Answer

@phi 
@ganeshie8  please help

zzr0ck3r · Answer

do you know how to find the magnitude of u?

zzr0ck3r · Answer

@Andreshoyos23 ?

anonymous · Answer

no

anonymous · Answer

but i belive i figured it out @zzr0ck3r

zzr0ck3r · Answer

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

anonymous · Answer

is it <-56, -63>

zzr0ck3r · Answer

that is the answer to the second part

zzr0ck3r · Answer

but the first part wants you to find the unit vector

anonymous · Answer

the magnitude is squared and rooted?

anonymous · Answer

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

zzr0ck3r · Answer

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

anonymous · Answer

ah !!!! ok :D i see