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Vector Problem  is this even solvable? 
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#1
Sep1011, 12:45 AM

P: 15

1. The problem statement, all variables and given/known data
2. Relevant equations I'm considering cross product and dot product rules, yet I don't know where to begin with this one. 3. The attempt at a solution I have two pages of scratch paper that is littered with failed attempts to solve the problem. There are no values for a or b given. Is there even enough information to solve these problems? 


#2
Sep1011, 12:57 AM

PF Gold
P: 346

this is basically a set of 2X2 simultaneous equation, which you can do by seperating the two components of each vector



#3
Sep1011, 01:02 AM

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Thanks
PF Gold
P: 6,727

Hint: a and b are constants which multiply the vectors A and B, respectively. There is no implied dot or cross product in the problem statement as shown.



#4
Sep1011, 01:18 AM

P: 15

Vector Problem  is this even solvable?
I think I'm on the right track... thanks guys. Can you confirm if this is heading in the correct direction?
a<81,73>+b<79,49>+<60,85>=<0,0> So, 81a79b+60=0 73a+49b+85=0 ? 


#6
Sep1011, 01:21 AM

P: 15

These numbers are ugly... mind sticking around until I work it out? :)



#7
Sep1011, 01:30 AM

P: 15

Still haven't figured it out :/



#8
Sep1011, 02:02 AM

PF Gold
P: 346

do you have to solve it by hand? or are you allowed to use calculators/computers?



#9
Sep1011, 02:03 AM

P: 15

Even if I solve it, I still think there's something going wrong... I'll use a computer. I just tried doing it with matrices, lol.



#10
Sep1011, 02:06 AM

PF Gold
P: 346

you can always substitute your answers back into the question and see if the identity holds, faster and simpler than rechecking all your steps



#11
Sep1011, 02:10 AM

P: 15

You're right  I have new values for a and b
a=5.520297 b=6.489422 Pretty sure I got it! Thank you for your help! 


#13
Sep1011, 02:12 AM

P: 15

It was correct  my online homework thing accepted it, lol. The algebra was just a little ambiguous.



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