来自和伟民的问题
已知二次函数的解析式y=4x^2+8x.写出这个函数的对称轴和定点坐标,并求其图像与x轴的交点的坐标
已知二次函数的解析式y=4x^2+8x.写出这个函数的对称轴和定点坐标,并求其图像与x轴的交点的坐标
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2020-03-19 14:28
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李银海
y=4x²+8x+4-4
=4(x+1)²-4
所以对称轴x=-1
顶点(-1,-4)
x轴上y=0
则4x²+8x=0
4x(x+2)=0
x=0,x=-2
所以与x轴的交点的坐标是(0,0),(-2,0)
2020-03-19 14:30:02
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