Finding the projection of a Vector

[chwala]

Homework Statement

Kindly see attached.

Relevant Equations

vector knowledge

I am looking at this now; pretty straightforward as long as you are conversant with the formula: anyway i think there is a mistake on highlighted i.e

Ought to be

$-\dfrac{15}{37}(i+6j)$

just need a confirmation as at times i may miss to see something. If indeed its a mistake then its time to look for a better resource.

 

[topsquark]

$1(3) + 6(-2) = 3 - 12 = -9$

Note the negative sign out front of the fraction.

-Dan

 

[anuttarasammyak]

Maybe you are confusing a vector unit $\mathbf{i}$ with imaginary unit i.

 

[chwala]

$1(3) + 6(-2) = 3 - 12 = -9$

Note the negative sign out front of the fraction.

-Dan

but

##\vec u= -i+4j+3k##

aaaaaargh let me take a break...thanks man.

 

[chwala]

Maybe you are confusing a vector unit $\mathbf{i}$ with imaginary unit i.

Actually, i was looking at the wrong question...you realise that i have posted a: question which is referenced to a totally different solution i.e b: solution.