simplification of the expression (b5)4.

b20

To simplify the expression (b^5)^4, you need to raise the base, b^5, to the fourth power.

When you raise a power to another power, you multiply the exponents. In this case, the exponent of the base is 5, and you need to multiply it by 4.

So, (b^5)^4 simplifies to b^(5*4), which is equal to b^20. Therefore, the simplified expression is b^20.