Question

Make f the subject of the formula I/f +1/u= 1/v and find the value of f when u =3 and v=2 SHOW WORKING

Answer 1

Step-by-step explanation:

$given \: that \: \\ u \: = 3 \: and \: v \: = 5 \\ \frac{1}{f} + \frac{1}{u} \: = \frac{1}{v} \\ \\ to \: find \: f \: \\ \\ \frac{1}{f} + \frac{1}{u} \: = \frac{1}{v} \\ put \: the \: \: value \: of \: u \: and \: v \: \\ \frac{1}{f} \: + \frac{1}{3} = \frac{1}{5} \\ \frac{1}{f} \: = \frac{1}{5} - \frac{1}{3} \\ \frac{1}{f} = \frac{3 - 5}{15} = \frac{ - 2}{15} \\ f \: = \frac{ - 15}{2}$

Answer 2

Step-by-step explanation:

1/f=1/u+1/v make f the subject of a formula

giventhat

u=3andv=5

f

1

+

u

1

=

v

1

tofindf

f

1

+

u

1

=

v

1

putthevalueofuandv

f

1

+

3

1

=

5

1

f

1

=

5

1

−

3

1

f

1

=

15

3−5

=

15

−2

f=

2

−15