Answer
$4x^2+6x^3$
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.
$=\dfrac{8x^4}{2x^2} + \dfrac{12x^5}{2x^2}
\\=4x^{4-2} + 6x^{5-2}
\\=4x^2+6x^3$
