X=5 because 4x5=20 and 20-4=16
Answer:
4y6+8y4-2y2-y+10... you start with the one with the highest power first .. end with the one with the least power...
We need to construct the perpendicular bisectors of at least two of the three sides.
The perpendicular bisector is the locus of points that ensures equal distance between any point on the line and the two ends of the segment.
The intersection of the two or three (congruent) perpendicular bisectors is the centre of the circumcircle.
Answer:
r=-4
Step-by-step explanation:

Hope that this is helpful.