Question

Resolva a equaçao incompleta no universo IR.y + 3 =72/y+3      y≠3

Answer 1

$y+3=\frac{72}{y+3} \ \ (y\neq-3)\\ \\ (y+3)^2=72\\ \\ y^2+6y+9-72=0\\ \\ y^2+6y-63=0\\ \\ \Delta=36+252=288\\ \\ y=\frac{-6\pm12\sqrt2}{2}\\ \\ y_1=6\sqrt2-3\\ \\ y_2=-6-6\sqrt2$