4^6x4^3
To simplify the expression 4^6 * 4^3, we can use the property of exponents that says a^m * a^n = a^(m+n) for any positive integer values of m and n.
Therefore, we can rewrite the expression as 4^(6+3).
Evaluating the exponent, 6+3 = 9.
So, 4^6 * 4^3 simplifies to 4^9.