Respuesta :

\left[x _{2}\right] = \left[ \frac{21\,y}{25}+\frac{\sqrt{\left( 25600 - 636\,y^{2}\right) }}{50}\right][x​2​​]=[​25​​21y​​+​50​​√​(25600−636y​2​​)​​​​​]