已知抛物线y=x平方-bx+8-b,若顶点在x轴上,b的值为,若顶点在y轴上,b= ,若抛物线经过原点,b=
人气:423 ℃ 时间:2020-02-03 15:25:41
解答
1.顶点在x轴上
Δ=b²+4b-32=0
(b+8)(b-4)=0
b=-8或4
2.顶点在y轴上
b=0
3.经过原点
0=8-b
b=8
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