Alright so it says find the center and radius of THIS :
Somehow they got numbers that WERENT variables in there
(Moved the x's together and put them in brackets) Like this :
(Then put these in)
What the HELL did they do to be able to do that? Like it cancels out so can i put whatever numbers i want in there as long as they equal 0 or something? In that case wouldnt using 1 make it easier?
Can post next steps of the answer if anyone would like