how do i do this

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NooNoo1
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#1
Report Thread starter 7 years ago
#1
i missed my first further maths lesson and he has set some hwk but i am really confused....i would really appreciate some help. the question is:

Find the values of p and q given that p+qi=1/12-5i
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j1i9s9s5
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#2
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#2
(Original post by NooNoo1)
i missed my first further maths lesson and he has set some hwk but i am really confused....i would really appreciate some help. the question is:

Find the values of p and q given that p+qi=1/12-5i
Equating real and imaginary parts of this equation will yield p and q. However the RHS is not immediately in a form that you can say this is the real part and this is the imaginary part. How can you re write the RHS so it is in the form a +bi (for some a and b)? HINT: Think about the conjugate of a complex number.
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Krollo
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#3
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You could also think about it as rationalising the denoninator.

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j1i9s9s5
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#4
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#4
(Original post by Krollo)
You could also think about it as rationalising the denoninator.

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No, You are 'making' the denominator real not rationalising.
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Krollo
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#5
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#5
(Original post by j1i9s9s5)
No, You are 'making' the denominator real not rationalising.
I said it could be thought of as rationalising as the processes are fairly similar. I never said it was rationalising.

Admittedly it's never a good idea to use wrong terminology, but you get where I'm coming from.
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Some Math Nerd
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#6
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#6
(Original post by Krollo)
I said it could be thought of as rationalising as the processes are fairly similar. I never said it was rationalising.

Admittedly it's never a good idea to use wrong terminology, but you get where I'm coming from.
Technically you are 'realising' the denominator.
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Some Math Nerd
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#7
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#7
Multiply the 1/(12-5i) by (12+5i)/(12+5i)

This gives (12+5i)/(144+25) = 12/169 + 5/169 i

so p=12/169 , q=5/169
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j1i9s9s5
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#8
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#8
(Original post by Some Math Nerd)
Multiply the 1/(12-5i) by (12+5i)/(12+5i)

This gives (12+5i)/(144+25) = 12/169 + 5/169 i

so p=12/169 , q=5/169
Please don't give them the answer straight away. You're supposed to try and help; not do it.
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