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)
Subtract. Simplify by removing a factor of 1 when possible.
(10bf)/(b^2-f^2)-(b-f)/b+f)
Thank you for your help
1 answer