x^-6/x^4

To simplify the expression, we can apply the exponent rule for division, which states that when dividing two numbers with the same base, we subtract the exponents:

x^-6/x^4 = x^(-6-4)

Now, subtracting the exponents, we get:

x^(-10)

Therefore, x^-6/x^4 simplifies to 1/x^10.