配方2x²-3x-7=2(x-m)²+n,则m= ( ),n=( ).
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配方2x²-3x-7=2(x-m)²+n,则m= ( ),n=( ).
配方2x²-3x-7=2(x-m)²+n,则m= ( ),n=( ).
配方2x²-3x-7=2(x-m)²+n,则m= ( ),n=( ).
2x²-3x-7=2(x-m)²+n=2x²-4mx+2m²+n
-4m=-3,2m²+n=-7
m=3/4,n=-65/8
2x²-3x-7=2(x-m)²+n=2x²-4mx+2m²+n
-4m=-3
m=3/4
2m²+n=-7
n=-2m²-7=-2x9/16-7=-9/8-7=-8又1/8
2x²-3x-7
=2(x²-3x/2)-7
=2(x²-3x/2 +9/16) -7-9/8
=2(x-3/4)² -65/8=2(x-m)²+n
对比,得m=3/4,n=-65/8
m=3/4,n=-65/8
2x²-3x-7
=2(x²-3/2x)-7
=2(x²-3/2x+9/16-9/16)-7
=2(x-3/4)²-9/8-7
=2(x-3/4)²-65/8
因为2x²-3x-7=2(x-m)²+n
则m= 3/4 ,n=-65/8