Question

E=2f to make the f the subject

Answer 1

Answer:

$f = \frac{E}{2}$

Step-by-step explanation:

Head on to the last paragraph if you don't need understanding of basic algebraic equation

....

• ALGEBRA EQUATION is where you have an equation that has an equal (=) sign

• for e.g. :
• 1=1
• 10=10
• 1+1=2

...

SO, what?

Well, you could find for example what's (2-1) from the information:

1+1=2

     1. write the equation:

1+1=2

    2. Do something to both sides to get rid of the (+1) in the left hand side

(1+1)-1 = (2)-1

 (2) -1= (2)-1

  2 - 1= 1

 

NOTE: YOU CAN'T DO SOMETHING DIFF. TO BOTH SIDES... IT HAS TO BE THE SAME.

....

This is how algebra works; if something is equal to something, then they will still be equal if you:

• Add both by same number
• subtract both by same number
• divide both by same number
• multiply both by same number

....

e.g.

saying 1+1 = 2        

(in other words is:)

2=2

(in other words is:)

(2)  =  (2)

(2)-1 = (2)-1

 1    =    1

(in other words is:)

 (2)   =  (2)

(2) +1 = (2) + 1

  3    =  3

(in other words is:)

(2)    =   (2)

 $\frac{(2)}{2}$   =    $\frac{(2)}{2}$

 1      =     1

(in other words is:)

(2)     =  (2)

(2)×2 =  (2)×2

  4     =   4

....

NOTE: you have to do the (multiplication/division/addition/subtraction) to the entire equation

...

e.g.

2 + 2 = 4

2 + $\frac{2}{2}$ = $\frac{4}{2}$

2 + 1  = 2

  3     =2

WRONG!!!

......

well, here is the correct:

(2 + 2) = (4)

$\frac{(2+2)}{4}$    = $\frac{(4)}{4}$

  $\frac{4}{4}$       =  $\frac{4}{4}$

  1       =  1

NOW CORRECT

....

WHY should we do it to the whole equation?

Well,

the entire : (2+2) = (4)

not only:           2 =   4

.

so if the entire equation equals entire equation in both sides. Then we have to (multiply/divide/add/subtract) the entire equations.

....

EXPRESSIONS:

• They express a number or a formula somehow
• They are written as symbols, like:
• x, y, f, e, E, z, v, d, t, (etc....)

so (v) could represent speed

    (d) could represent distance

      (t) could represent time

Where they could be put in equation:

$speed=\frac{distance}{time}$

OR

$v=\frac{d}{t}$

.....

If the same symbol is applied it means same number or subject

e.g.

$v + v = 2v$ ( 2v means 2×v)

(Any number added by the same number = 2 × the number )

Like,

1 + 1 = 2 × 1

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MAKING SUBJECTS:

let's say:

2 + 2 = 1 + 3

you want to make (3) the subject..

write equation: $(2 + 2) = (1+3)$

apply:                $(2 + 2) - 1 = (1+3)-1$

complete:          $2 + 2 -1 = 3$

simplify:             $2+1=3$

so:                      3       =  2 + 1

..

LAST PARAGRAPH

Your question:

make f subject in E=2f

...

write equation: $(E) = (2f)$

apply:                $\frac{(E)}{2} = \frac{(2f)}{2}$

complete:          $\frac{E}{2} = F$

so:                      $f=\frac{E}{2}$

.......

I HOPE YOU GET IT ALL NOW!