# Need help on 2 Maths Questions

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#1
1) I managed to get all the other vector questions correct but I can't seem to do the last vector question which involves finding the vector P closest to the origin.

2) I got part A right but I'm struggingling with part B

Attachment 523431523433
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5 years ago
#2
For question 2), use A = x and B = 1, and solve from there. Use the formulas for cosh and sinh to work out what cosh(1) and sinh(1) are.

I can't remember how you'd solve question 1), I think it's just some result that you have to memorise, have a look through your textbook.
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#3
(Original post by TimGB)
For question 2), use A = x and B = 1, and solve from there. Use the formulas for cosh and sinh to work out what cosh(1) and sinh(1) are.

I can't remember how you'd solve question 1), I think it's just some result that you have to memorise, have a look through your textbook.
Got question 2, thanks

I did have a look in the textbook for the vector question but there's nothing there :/
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5 years ago
#4
(Original post by creativebuzz)
Got question 2, thanks

I did have a look in the textbook for the vector question but there's nothing there :/
Ok, find the plane that is perpendicular to l, and includes the origin. Then find the point at which l crosses the plane, and that's your P.
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#5
(Original post by TimGB)
For question 2), use A = x and B = 1, and solve from there. Use the formulas for cosh and sinh to work out what cosh(1) and sinh(1) are.

I can't remember how you'd solve question 1), I think it's just some result that you have to memorise, have a look through your textbook.

Attachment 523451523453

I think I've got the answer to the vector question now! But would you mind spotting where I got part e correct? I got the other answers right but not this one :/
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5 years ago
#6
(Original post by creativebuzz)

Attachment 523451523453

I think I've got the answer to the vector question now! But would you mind spotting where I got part e correct? I got the other answers right but not this one :/
Decided to do the entire question to help, here's my answers for parts d and e:

Also, thanks for the follow!
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#7
(Original post by TimGB)
Decided to do the entire question to help, here's my answers for parts d and e:

Also, thanks for the follow!
Ah I see what you've done, thank you! If I could rep you again I definitely would

Do you have any advice on how to get better at questions like those? You seem to be really good at it
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5 years ago
#8
(Original post by creativebuzz)
Ah I see what you've done, thank you! If I could rep you again I definitely would

Do you have any advice on how to get better at questions like those? You seem to be really good at it
Practise a lot. Learn key formulas like the quadratic formula and the trig formulas. Just try and stay calm during questions/exams - you know the content, so you have the knowledge required to answer all the questions. The brain has a tendency to take shortcuts when stressed, so useful long term memory facts are often ignored in situations of high stress.
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