# A level maths

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#1
http://prntscr.com/16c3kg7 Help please as I am confused.
Is it 8i-2j+ai+bj+ai-bj=0? Please show me the working out
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1 month ago
#2
http://prntscr.com/16c3kg7 Help please as I am confused.
Is it 8i-2j+ai+bj+ai-bj=0? Please show me the working out
What did you get as the values for a and b?
0
1 month ago
#3
http://prntscr.com/16c3kg7 Help please as I am confused.
Is it 8i-2j+ai+bj+ai-bj=0? Please show me the working out
Check the bit in bold above.
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#4
(Original post by laurawatt)
What did you get as the values for a and b?
a=-8
B i dont know
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#5
(Original post by Plücker)
Check the bit in bold above.
Becomes 8i-2j +2ai=0 (bj-bj becomes nothing)
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1 month ago
#6
a=-8
Not quite, you’re almost there. When you split up what you wrote in your first post into just the ‘i’ component you get 8i+ai+ai=0, so 8i+2ai=0
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1 month ago
#7
Becomes 8i-2j +2ai=0 (bj-bj becomes nothing)
Plücker is wanting you to look at the F3 in the question, then look at what you’ve written for F3
1
#8
(Original post by laurawatt)
Not quite, you’re almost there. When you split up what you wrote in your first post into just the ‘i’ component you get 8i+ai+ai=0, so 8i+2ai=0
oh a=-4
Then for b idk
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1 month ago
#9
oh a=-4
Then for b idk
Yeah that’s good
So to find b we do the same thing as we did to find a, but we focus on the ‘j’ component instead , give it a try and post what you get?
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#10
(Original post by laurawatt)
Yeah that’s good
So to find b we do the same thing as we did to find a, but we focus on the ‘j’ component instead , give it a try and post what you get?
b=3 ?
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1 month ago
#11
b=3 ?
Yep
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#12
(Original post by laurawatt)
Yep
Thank you.
Part B)will be
-8i+2j (F1 is reversed) -4i+3j +-4i-j
= -16i +4j is the answer for part B?
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#13
(Original post by laurawatt)
Yep
is part b -16i+4j ? Thank you for the help
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1 month ago
#14
is part b -16i+4j ? Thank you for the help
Yep think so
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