Solve the Equation $x ^ { 3 } + 7 x ^ { 2 } = x ^ { 2 } - 9 x$

question 70

Multiple Choice

Solve the equation. $x ^ { 3 } + 7 x ^ { 2 } = x ^ { 2 } - 9 x$

• A) \(x = 3,0\)
• B) \(x = - 3\)
• C) \(x = - 3,0\)
• D) \(x = - 3,3,0\)
• E) \(x = 3\)

---

Definitions:

Leading Phase

A condition in an AC circuit where the voltage wave is ahead of the current wave in time, indicating capacitive properties.

Skin Effect

The tendency of an alternating electrical current to become distributed within a conductor such that the current density is largest near the surface of the conductor, and decreases with greater depths in the conductor.

Eddy Currents

Circulating currents induced within conductors by a changing magnetic field, often leading to energy loss.

Insulation

Material used to prevent the passage of electricity, heat, or sound from one area or substance to another by providing a barrier or covering.