Posted by Esther on Friday, March 11, 2011 at 10:43pm.
the actual subtraction part is easy: it's two factions being subtracted, which can only be done if they have the SAME denominator. So... the common denominator for the new fraction will be
(b^2 - f^2)(b + f)
the numerator is
(10bf)*(b + f) - (b - f)*(b^2 - f^2)
the new fraction is
(10bf)*(b + f) - (b - f)*(b^2 - f^2)
-----------------------------------
(b^2 - f^2)(b + f)
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