Final answer:
The result of the mathematical expression (6) * (-4) is -24 because multiplying a positive number by a negative number yields a negative result.
Step-by-step explanation:
To solve the mathematical expression (6) * (-4), we apply the rule that states when two numbers multiplied have opposite signs, the answer has a negative sign. This can be represented as a * (-b) = - (a * b), where 'a' is a positive number and 'b' is a positive number, also. The multiplication operation for the given expression is 6 * (-4) = - (6 * 4) = -24. Thus, the result of the expression (6) * (-4) is -24.