SOLUTION: Solve the following literal equation: Solve f= 1/r sub 1 + 1/r sub 2 for r sub 1 I do not understand these subs...Please help explain

Algebra ->  Expressions-with-variables -> SOLUTION: Solve the following literal equation: Solve f= 1/r sub 1 + 1/r sub 2 for r sub 1 I do not understand these subs...Please help explain      Log On


   

Question 347709: Solve the following literal equation:
Solve f= 1/r sub 1 + 1/r sub 2 for r sub 1
I do not understand these subs...Please help explain
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Don't get hung up on that.
f=1%2Fa%2B1%2Fb where a=r%5B1%5D, b=r%5B2%5D
Multiply both sides by ab
abf=b%2Ba
abf-a=b
a%28bf-1%29=b
a=b%2F%28bf-1%29
r%5B1%5D=r%5B2%5D%2F%28f%2Ar%5B2%5D-1%29