book Maths Puzzle Numerical Ability

Where is the center of 25(x+5)^2 + 4(y-3)^2 = 100 ?

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Hi I am trying to seperate the following into its real and imaginary parts, but I cannot remember how to do this:
(jwl - j/wc)/(R+jwl - j/wc)
I have tried using the complex con
use the properties of logarithms to condense the following expression:
1) 3 ln x + 2 ln (x+1)