用配方法把二次函数y=-2x²+x-4改为形如y=a(x-h)²+k的形式?
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发布时间:2024-03-22 12:50
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热心网友
时间:2024-03-23 23:11
y=-2(x²-x/2)-4
=-2(x²-x/2+1/16-1/16)-4
=-2(x²-x/2+1/16)+1/8-4
=-2(x-1/4)²-31/8
热心网友
时间:2024-03-23 23:10
y=a(x-h)²+k
=ax²-2ahx+ah²+k
a=-2
-2ah=1
h=1/4
ah²+k=-4
k=-31/8
y=-2(x-1/4)²-31/8
热心网友
时间:2024-03-23 23:15
y=-2x²+x-4
=-2(x²-1/2x)-4
=-2(x-1/4)²+1/8-4
=-2(x-1/4)²-31/4
热心网友
时间:2024-03-23 23:13
y=-2(x-1/4)²-31/8
热心网友
时间:2024-03-23 23:07
y=-2x²+x-4
=-2(x²-½x+2)
=-2[x²-½x+(1/16)-(1/16)+2]
=-2[(x-¼)²+(31/16)]
=-2(x-¼)²-(31/8)
热心网友
时间:2024-03-23 23:10
y=2(x+1/4)*-65/16