Respuesta :

mathstudent55

Answer:

f = (uv)/(u + v)

Step-by-step explanation:

1/u = 1/f - 1/v

Multiply both sides by ufv.

ufv(1/u) = ufv(1/f) - ufv(1/v)

fv = uv - uf

fv + uf = uv

f(v + u) = uv

f = (uv)/(u + v)