Please help or I'll fail?

Question

Does anyone know how to subtract fractions here is one and can you please explain it to me 3a/4 - a/4 explain

Answer 1

3a/4 - a/4= 2a/4


you have the 4 'below" so theres not need in changing anything

you do it as if it was 3a-a

Answer 2

yes

the example you gave is pretty basic, just subtract the numerators (3a - a)/4 = 2a/4

you can do this because you have a common denominator (the denominator is the same, 4

what becomes tricky is when the denominator is not the same. in those cases you have to make them the same; example...

3a/4 -a/2 = ?

a/2 =2a/4 (if you multiply the top and bottom numbers by the same number the fraction is the same)

therefore
3a/4 - 2a/4 = a/4

Answer 3

hmm, illl try and explain this as best i can without paper to show you.

ok, so we know a is a variable, it is an unknown, but we know that they are both the same variable, so it doesnt really matter. lets, for ease of use, say that a=1

this means you are doing
3 1/4
- 0 1/4 (lets pretend theres a 0 there for ease of use
______
so, ignore the 3, we dont need it right now, we only have 1/4 and 1/4, which cancel each otehr out, so now its

3
-0
_______

this is, of course, 3


hope that helps

Answer 4

C'mon. You can do this one.

a/2. Now figure out how I got there.