SOLUTION: 3a/4b - 2a/5b i got 3a*5b/4b*5b - 2a*4b/4b*5b= 15ab/20b - 8ab/20b = 7ab/20b is that correct? if not can you plese help me arrive at the right answer

SOLUTION: 3a/4b - 2a/5b i got 3a5b/4b5b - 2a4b/4b5b= 15ab/20b - 8ab/20b = 7ab/20b is that correct? if not can you plese help me arrive at the right answer

Question 870127: 3a/4b - 2a/5b
i got 3a*5b/4b*5b - 2a*4b/4b*5b= 15ab/20b - 8ab/20b = 7ab/20b
is that correct? if not can you plese help me arrive at the right answer
Answer by Theo(13342) (Show Source): You can put this solution on YOUR website!
correct except for the last step.

7ab / 20b is equal to 7a/20 because the b in the numerator and denominator cancels out.

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