# Further maths help needed!

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#1
(A+bi)(2+i)=a-3i

Can someone help me solve it, as I try to do 2 simultaneous equations but I can’t get an answer that works for both equation since I keep getting the simultaneous equations a+2b=3, and the is a-b=0
0
1 year ago
#2
(Original post by Juliakinga)
(A+bi)(2+i)=a-3i

Can someone help me solve it, as I try to do 2 simultaneous equations but I can’t get an answer that works for both equation since I keep getting the simultaneous equations a+2b=3, and the is a-b=0
They should be

a-b = 0

a+2b = -3
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#3
(Original post by RDKGames)
They should be

a-b = 0

a+2b = -3
Thank you, but when you substitute what you got for a or b into the first equation, a=b, but if you substitute it into the second equation you get a different answer which doesn’t work for the first equatjkn
0
1 year ago
#4
(Original post by Juliakinga)
Thank you, but when you substitute what you got for a or b into the first equation, a=b, but if you substitute it into the second equation you get a different answer which doesn’t work for the first equatjkn
Yes it does work. a=b=-1 are the solutions to these two equations simultaneously.
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#5
(Original post by RDKGames)
Yes it does work. a=b=-1 are the solutions to these two equations simultaneously.
Thank yiu
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