To simplify the expression x6 / x3, you can use the properties of exponents.
According to the rules of exponents, when you divide two powers with the same base, you subtract the exponents. So, in this case, you subtract the exponent in the denominator from the exponent in the numerator:
x6 / x3 = x(6 – 3) = x3
Thus, the simplified form of the expression is x3.