How do you subtract #\frac { - 3} { 4} - \frac { 9} { - 7}#?

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Answer 1 · 2018-04-21T20:06:10

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Answer 2 · 2018-04-21T20:10:30

#57/28#

#a/b-c/d=(ad-cb)/(bd)#

#-3/4-9/-7=((-3xx-7)-(4xx-9))/(4xx-7)#

#=(21+36)/28=57/28#