(1).x²-2x-3=(x- 1 )²+ ( -4 )(2).x²+3x+2=(x+ 3/2 )²+ (-1/4)(3).2x²+5x+4=2(x+ 5/4 )+ 7/8
x^2-2x-3=(x-1)^2-4; (2).x^2+3x+2=(x+3/2)^2-1/4; (3).2x^2+5x+4=2(x+5/4)+7/8.
(X+1)^2+(-4).。。。(x+3/2)^2+(-1/4)....2(x+5/4)^2+7/8
1,4,2,2,2,2x