Un número más la terceraparte de su cuadrado esigual a cinco veces elnúmero?

Respuesta : Explicación paso a paso : <img src="https://tex.z-dn.net/?f=%5Ctexttt%7BSi%20llamamos%20x%20al%20n%5C%27umero%20entonces%3A%7D%5C%5C%5C%5C%5Cfrac%7Bx%5E%7B2%7D%7D%7B3%7D%5C%2C%5C%2C%5Ctexttt%7B%28es%20la%20tercera%20parte%20de%20su%20cuadrado%29%7D%5C%5C%5C%5C5x%5C%2C%5C%2C%5Ctexttt%7B%28es%20cinco%20veces%20el%20n%5C%27umero%29%7D%5C%5C%5Ctexttt%7BPor%20lo%20tanto%3A%7D%5C%5C%5C%5Cx%2B%5Cfrac%7Bx%5E%7B2%7D%7D%7B3%7D%3D5x%5C%5C%5Ctexttt%7BReordenamos%20y%20simplificamos%3A%7D%5C%5C%5C%5C%5Cfrac%7Bx%5E%7B2%7D%7D%7B3%7D%2Bx-5x%3D0%5C%5C%5Cfrac%7Bx%5E%7B2%7D%7D%7B3%7D-4x%3D0%5C%5C%5Ctexttt%7BResolvemos%3A%7D%5C%5C%5C%5C%5Cfrac%7Bx%7D%7B3%7D%28x-12%29%3D0%5C%5Cx_%7B1%7D%3D0%5C%5Cx_%7B2%7D%3D12" />.