摘要：求下列二次函数的图像与x轴的交点坐标,并作草图验证. (1)y=x2+x+1; (2)y=4x2-8x+4; (3)y=-3x2-6x-3; (4)y=-3x2-x+4
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求下列二次函数的图像与x轴的交点坐标,并作草图验证.
(1)y=
x2+x+1; (2)y="4x2-8x+4; " (3)y="-3x2-6x-3; " (4)y=-3x2-x+4
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(1)y=
x2+x+1; (2)y="4x2-8x+4; " (3)y="-3x2-6x-3; " (4)y=-3x2-x+4
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x2+x+1; (2)y="4x2-8x+4; " (3)y="-3x2-6x-3; " 
(4)y=-3x2-x+4
x2+x+1; (2)y=4x2-8x+4;
(3)y=-3x2-6x-3; (4)y=-3x2-x+4
x2+x+1;
(2)y=4x2-8x+4; (3)y=-3x2-6x-3; (4)y=-3x2-x+4