Answer:
y= -(x+5)^2+4
Step-by-step explanation:
Use transformations
4 lol I am definitely positive I am right about that :}
The triangles ABD, ADC and ABC are similar (AA stands for "angle, angle" and means that the triangles have two of their angles equal).
If two triangles have two of their angles equal, the triangles are similar.
Therefore the sides of triangles are in proportion.

cross multiply

Use the Pythagorean theorem for calculate x:

Answer:
The coordinates of A could be anything in the form of (x, y, z) if you have a third axis. First you count where A is on the x-axis then the y-axis and if you have a 3-dimensional graph then the z-axis.
Step-by-step explanation: