The given expression consists of multiple terms being multiplied together. To simplify the expression, we need to multiply the coefficients and combine the variables with the same base. In this case, the coefficients are 3, 2, 4, and 4. When multiplied together, they give us 12. The variables consist of h and b, and we have h raised to the power of 2, h raised to the power of 3, b raised to the power of 3, and b raised to the power of 4. Combining the variables with the same base, we get h raised to the power of 5 and b raised to the power of 7. Therefore, the simplified expression is 12h5b7.