Dear student 1u+1v=1f1-(f+x)+1-(f+y)=1-f1(f+x)+1(f+y)=1ff+y+f+x(f+x)×(f+y)=1ff2+fx+fy+f2=f2+fx+fy+xyf2=xyf=xyRegards

Pls answer fast

Dear student

\frac{1}{u} + \frac{1}{v} = \frac{1}{f} \frac{1}{- (f + x)} + \frac{1}{- (f + y)} = \frac{1}{- f} \frac{1}{(f + x)} + \frac{1}{(f + y)} = \frac{1}{f} \frac{f + y + f + x}{(f + x) \times (f + y)} = \frac{1}{f} f^{2} + f x + f y + f^{2} = f^{2} + f x + f y + x y f^{2} = x y f = \sqrt{x y} R e g a r d s

Pls answer fast ​