# Logarithms and exponential functions

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#1
e^(3x+4y)=2e^(2x-y)
e^(2x+y)=8e^(x+6y)
Solve the simulteneous equation giving your ans in exact form
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1 month ago
#2
(Original post by Shas72)
e^(3x+4y)=2e^(2x-y)
e^(2x+y)=8e^(x+6y)
Solve the simulteneous equation giving your ans in exact form
What rules did you learn for manipulating powers, in GCSE?
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#3
(Original post by David Getling)
What rules did you learn for manipulating powers, in GCSE?
So you do e^3x×e^4y×e^y/e^2x =2
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1 month ago
#4
(Original post by Shas72)
So you do e^3x×e^4y×e^y/e^2x =2
And what is the rule for dividing powers?
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#5
(Original post by David Getling)
And what is the rule for dividing powers?
So I got e^(x+5y)=2 and e^(x-5y)=8
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#6
(Original post by David Getling)
And what is the rule for dividing powers?
Thanks a lot
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#7
(Original post by David Getling)
And what is the rule for dividing powers?
Can you also pls help me with one more problem
Solve ln(2x+1)<ln(x+4)
When I did this I get only x<3 , but the ans is -1/2<x<3
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1 month ago
#8
(Original post by Shas72)
Can you also pls help me with one more problem
Solve ln(2x+1)<ln(x+4)
When I did this I get only x<3 , but the ans is -1/2<x<3
What is the domain of ln?
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