SOLUTION: Solve for a: 1/f=1/a+1/b I know the answer is a=bf/b-f

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Question 452887: Solve for a:
1/f=1/a+1/b
I know the answer is a=bf/b-f
Answer by htmentor(1343) About Me  (Show Source):
You can put this solution on YOUR website!
Solve for a:
1/f=1/a+1/b
1/a = 1/f - 1/b
1/a = (b - f)/bf [combining the two fractions using the least common denominator bf]
Taking the reciprocal gives:
a = bf/(b-f)