Answer
$5a^6+8a^2$
Work Step by Step
Recall the following rule: $\frac{a^{m}}{a^{n}}=a^{m-n}$
In order to solve this problem, use the rule above and cancel out common factors that are in both the numerator and the denominator of the fraction.
$=\dfrac{-60a^7}{-12a} - \dfrac{96a^3}{-12a}
\\=5a^{7-1}+ 8a^{3-1}
\\=5a^6+8a^2$
