make sure a=1 subtract c from both sides take 1/2 of b and square it add that to both sides factor perfect square
1x^2-1x-2=0 a=1 move c to other side add 2 to oth sides x^2-1x=2 take 1/2 of b and square it 1/2 of -1=-1/2 squaer it 1/4 add that to both sides x^2-1x+1/4=2+1/4 factor left side (x-1/2)=2+1/4