# How do you simplify -(2x)/a^-4 and write it using only positive exponents?

Jan 7, 2017

We can use a rule of exponents to simplify this expression. See full explanation below

#### Explanation:

We can use the following rule for exponents to simplify this expression to use only positive exponents:

${z}^{b} = \frac{1}{z} ^ b$ and therefore $\frac{1}{z} ^ - b = {z}^{b}$

Applying this to the expression in the problem gives:

$- 2 x {a}^{4}$ or $- 2 {a}^{4} x$