Cuanto es X×(x + 2) = 2x + 81?

<img src="https://tex.z-dn.net/?f=x%5Cleft%28x%2B2%5Cright%29%3D2x%2B81" />

<img src="https://tex.z-dn.net/?f=%5Cmathrm%7BPoner%5C%3Alos%5C%3Aparentesis%5C%3Autilizando%7D%3A%5Cquad%20%5C%3Aa%5Cleft%28b%2Bc%5Cright%29%3Dab%2Bac" />

<img src="https://tex.z-dn.net/?f=x%5E2%2B2x%3D2x%2B81" />

<img src="https://tex.z-dn.net/?f=%5Cmathrm%7BRestar%5C%3A%7D2x%2B81%5Cmathrm%7B%5C%3Ade%5C%3Aambos%5C%3Alados%7D%3A" />

<img src="https://tex.z-dn.net/?f=x%5E2%2B2x-%5Cleft%282x%2B81%5Cright%29%3D2x%2B81-%5Cleft%282x%2B81%5Cright%29" />

<img src="https://tex.z-dn.net/?f=x%5E2-81%3D0" />

<img src="https://tex.z-dn.net/?f=Factorizar%3A" />

<img src="https://tex.z-dn.net/?f=%28x-9%29%28x%2B9%29%3D0" />

<img src="https://tex.z-dn.net/?f=%5Cmathrm%7BLas%5C%3Asoluciones%5C%3Afinales%5C%3Aa%5C%3Ala%5C%3Aecuacion%5C%3Ade%5C%3Asegundo%5C%3Agrado%5C%3Ason%3A%5C%3A%7D" />

<img src="https://tex.z-dn.net/?f=x%3D9%2C%5C%3Ax%3D-9" />.