Step 1 :Set the inequality to 0: \(3x^3 + 24x^2 > 0\)
Step 2 :Factor out a common factor of \(3x^2\): \(3x^2(x + 8) > 0\)
Step 3 :Find the zeros of the inequality by setting each factor equal to 0: \(3x^2 = 0\) gives \(x = 0\) and \(x + 8 = 0\) gives \(x = -8\)
Step 4 :Test a number from each interval in the inequality to determine the sign in that interval. For \((-\infty, -8)\), test \(x = -9\): \(3(-9)^2(-9 + 8) = -243\) which is less than 0. For \((-8, 0)\), test \(x = -1\): \(3(-1)^2(-1 + 8) = 21\) which is greater than 0. For \((0, \infty)\), test \(x = 1\): \(3(1)^2(1 + 8) = 27\) which is greater than 0.
Step 5 :The solution to the inequality is where the expression is positive, which is in the intervals \((-8, 0)\) and \((0, \infty)\).
Step 6 :\(\boxed{(-8, 0) \cup (0, \infty)}\) is the solution in interval notation.