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