Symmetry axis -b/2a = 1, vertex coordinate x= 1, y=3.

It is best to choose integer points or special points for tracking points, such as the point where vertex coordinates intersect with the X-Y axis.

This a<0, so the opening is downward, will decrease when it is greater than 1, so y2 >: y 1

22.

1. Because the angle is 45 degrees, AC=AB=6 10.

2. let CD = X.

Tan 39 = (610-x)/610, only x is calculated.

I hope I can help you ~