Question 630252
(a/b)(c/d) = 1 ... Start with the given equation


a/b = 1(d/c) ... Multiply both sides by d/c.


a/b = d/c ... Multiply


a/b - d/c = 0 ... Subtract d/c from both sides.


(a/b)(c/c) - (d/c)(b/b) = 0 ... Multiply the first fraction by c/c and the second by b/b


ac/bc - bd/bc = 0 ... Multiply


(ac - bd)/bc = 0 ... Combine the fractions.


ac - bd = 0*bc ... Multiply both sides by bc.


ac - bd = <font color="red">0</font> ... Multiply



So the answer is   ac - bd = <font color="red">0</font>


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