# Rewriting an expression what math operation did my teacher do?

Gold Member
Rewriting an expression....what math operation did my teacher do?

I'm trying to see how did my teacher rewrite this expression in the following manner:

[Broken]

What mathametical operation did he do? I really can't see it...

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danago
Gold Member
Have you definitely copied it correctly? If the S2 term in the denominator were S2/C then it would seem that he divided the numerator and denominator by RLC.

MathematicalPhysicist
Gold Member
Simple algebraic manipulation, dividing the numerator by RCL and also the denominator.

He forgot 1/C in the denominator for S^2.

HallsofIvy