What is the factored form of a^2-121

The solution set for 5v2 – 125 = 0 is

(01.02 lc) angle abc has point e on ray ba and point d on ray bc. points e and d are equidistant from point b. to bisect angle abc, which of the following needs to be identified for the construction? the distance between points e and d the point in the angle that is equidistant from points e and d the endpoint of rays ba and bc the point outside of the angle that is equidistant from points e and d

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?