Create a common denominator for the right side
1/f = (v + u)/uv
Then just invert the fractions. (That is an algebraically allowed operation).
f = uv/(u + v)
1/f= 1/u + 1/v
make f the subject of the formulae
thank you in advance!
2 answers
f =1-1/v / 1/u
1 answer