Resposta :
Hola,
[tex]a=-2\\b=6\\c=7 \\\Delta=b^2-4ac\\ \Delta=-\frac{\Delta}{4a}\\ v_y= -\frac{\Delta}{4a}\\ \Delta=6^2-4*(-1)*7\\\Delta=36+28\\ \Delta=64\\v_y= -\frac{\Delta}{4a}\\ v_y =-\frac{64}{4*(-1)}\\ v_y = \frac{64}{4}\\\boxed{v_y = 16},letra~d [/tex]
[tex]a=-2\\b=6\\c=7 \\\Delta=b^2-4ac\\ \Delta=-\frac{\Delta}{4a}\\ v_y= -\frac{\Delta}{4a}\\ \Delta=6^2-4*(-1)*7\\\Delta=36+28\\ \Delta=64\\v_y= -\frac{\Delta}{4a}\\ v_y =-\frac{64}{4*(-1)}\\ v_y = \frac{64}{4}\\\boxed{v_y = 16},letra~d [/tex]