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

$57/28$

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

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

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

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