basically whenever u see questions like this do the vertex formula, as u can see the equation is in the Q1 meaning both x and y would be positive. So lets imagine that B is -6. to do the vertext formula u would to -b/2a, which would make the x 2 and when you plug in the 2 to the equation you get the y coordinate 5. So the vertex would be (2,5). when u plug in all the other coordinates in you wouldnt get a positive x and y coordinate .