问题
填空题
将y=2x2-12x-12变为y=a(x-m)2+n的形式,则m•n=______.
答案
∵y=2x2-12x-12=2(x2-6x+9)-18-12=2(x-3)2-30,
∴m=3,n=-30,
∴m•n=-90.
将y=2x2-12x-12变为y=a(x-m)2+n的形式,则m•n=______.
∵y=2x2-12x-12=2(x2-6x+9)-18-12=2(x-3)2-30,
∴m=3,n=-30,
∴m•n=-90.