Formula Question Help different, opposite, apologize

troymo

I apologize in advance if this is a dumb question or has been answered in the past. So I’ve been studying for about a week now and realized that many of the CFA questions will be based off a formula, but with the variables in different places. I’ve seen this throughout the Quant sections.
I haven’t studied in years, but does anyone have a guide to what happens with a variable switches to the opposite side of =?
I obviously know the basics like subtraction/division.
But an example is question 20 on page 235 of the Schewser book.
The question asks to find the variance of returns for stock A. The formula that you memorize is the Correlation (RA,RB) = CovRA,RB) / (

maxmeomeo

Thats what I’m trying to get help on. I know the formula, but somtimes get confused when making a part variable independent and how the new formula will look.