将y=(2X-1)(X+2)+1化成y等于a(X+m)+n的形式.

问题描述:

将y=(2X-1)(X+2)+1化成y等于a(X+m)+n的形式.

y=(2X-1)(X+2)+1 =2x2+3x-2+1 =2x2+3x-1 =2(x2+3/2-1/2) =2[(x+3/4)2-9/4-1/2] =2(x+3/4)2-11/2