Question

If 1/u=1/f-1/v is the formula Express f as the subject of the formula​

Answer 1

f = uv/(v+u)

Explanation:

1/u = 1/f - 1/v

1/u + 1/v = 1/f

(v+u) ÷ uv = 1 ÷ f

multiply both sides by uvf

f(v+u) = uv

f = uv / (v+u)

Answer 2

`f = (1)/((1)/(u)+(1)/(v) )`

Explanation:

`1/u=1/f-1/v\\(1)/(f) = (1)/(v) +(1)/(u) \\Divide- both- sides- by; 1\\(1)/(f) / (1)/(1) = ((1)/(v) + (1)/(u)) / (1)/(1)\\\\f = (1)/((1)/(u)+ (1)/(v) )`