posted by Rachal

Find the unit vector in the direction of <-1,-2>.

I get (-1/sqrt10) and (-3/sqrt10)

1. Marth

What is the length of <-1,-2>? Divide <-1,-2> by its length, giving the result a length of 1 - an unit vector.

## Similar Questions

1. ### sciecne

In unit-vector notation, what is the sum of vector a =(4m)i + (3m)j and vector b= (-13m)i +(7m)j?
2. ### Math

Is this correct: sqrt2/sqrt10=sqrt2/5sqrt2 nope. it would be sqrt2/(sqrt5)(sqrt2) no.d sqrt2/sqrt10= sqrt (2/10)= sqrt (1/5) sqrt 0.2 thanks can you help me with this please?
3. ### algebra

Can someone please check my work on this problem?
4. ### Math

Find the exact solution to 6x^2+1=-8x by using the Quadratic Formula. A)-4+-(sqrt10) B)-4+-(sqrt22)/6 C)-2+-2(sqrt10)/3 D)-4+-(sqrt10)/6 I chose C x=-b+-(sqrtb^2-4ac)/2a x=--8+-(sqrt-8^2-4(6)(1))/2(6) x=8+-(sqrt64-24)/12 x=8+-(sqrt40)/12 …
5. ### algebra

How do I work this to get the answer because I am stuck. Help, Help, please anyone. Ihope that you are able to understand what I am asking. 3 SQRT10 over SQRT15 2 over 5+SQRT3
6. ### math

lim x->1 [(sqrt10-x)-3]/[1-(1/x)] Help please, Thankyou
7. ### Pre-Calculus

Given that SIN Theta = -1/sqrt(10) and theta is in quadrant 4, find sin2theta and cos2theta. I'm not sure how to properly square the -1/sqrt10 and keep an exact answer other than decimal. Otherwise, my final answer is 1.632455533
8. ### trig

Given that SIN Theta = -1/sqrt(10) and theta is in quadrant 4, find sin2theta and cos2theta. I'm not sure how to properly square the -1/sqrt10 and keep an exact answer other than decimal. Otherwise, my final answer is Sin2Theta = -.7255970691 …
9. ### calculus

Find a unit vector U such that the rate of change of f in the direction of U at the given point is maximum. point being (3,5,pi) I know hos to do this when given a direction but since im asked to ind the unit vector first it kinda …