Posted by **Jon** on Thursday, February 21, 2008 at 2:02pm.

Simplify: (4m/5n^2)-(n/2m)

A)(8m^2-5n^3)/10n^2m

B)(8m^2+5n^3)/10n^2m

C)(4m-n)/(5n^2-2m)

D)2/5n^2

I chose C

4m/5n^2 - n/2m

4m/5(n)^2 - n/2(m)

C

- Algebra -
**Kat**, Thursday, February 21, 2008 at 4:47pm
You need to find a common denominator for the two fractions you are trying to subtract. Simplifying the problem:

A/B - C/D = (A*D-C*B)/(B*D)

In this case,

A=4m

B=5n^2

C=n

D=2m

So, A*D=4m*2m=8m^2

C*B=n*5n^2=5n^3

B*D=5n^2*2m=10n^2m

Substituting this into the simplified equation gives:

(8m^2-5n^3)/(10n^2m) which is answer (A)

A clue to the correct answer is that (A) and (B) are only a little different, so it's probably one of them!

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