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

Question

1358 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-04-21T20:06:10

.

.

Answer 2 · 2018-04-21T20:10:30

$\frac{57}{28}$ $57/28$

$\frac{a}{b} - \frac{c}{d} = \frac{a d - c b}{b d}$ $a/b-c/d=(ad-cb)/(bd)$

$- \frac{3}{4} - \frac{9}{- 7} = \frac{(- 3 \times - 7) - (4 \times - 9)}{4 \times - 7}$ $-3/4-9/-7=((-3xx-7)-(4xx-9))/(4xx-7)$

$= \frac{21 + 36}{28} = \frac{57}{28}$ $=(21+36)/28=57/28$

How do you subtract −34−9−7\frac { - 3} { 4} - \frac { 9} { - 7}?