Subtract the rational expressions. Be sure to express your answer in simplest form. $\frac { n - 4 } { 9 } - \frac { n - 7 } { 12 }$
A) $\frac { 3 n + 5 } { 108 }$
B) $\frac { 21 n - 37 } { 108 }$
C) $\frac { n + 5 } { 36 }$
D) $\frac { n - 37 } { 36 }$

Question

Quizplus · Accepted Answer

To subtract the rational expressions, find a common denominator, which is 36. Rewrite each fraction: $\frac{4(n-4)}{36} - \frac{3(n-7)}{36}$. Simplify: $\frac{4n-16 - (3n-21)}{36} = \frac{n + 5}{36}$.

Subtract the Rational Expressions n−49−n−712\frac { n - 4 } { 9 } - \frac { n - 7 } { 12 }9n−4​−12n−7​

Subtract the Rational Expressions $\frac { n - 4 } { 9 } - \frac { n - 7 } { 12 }$