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进入初三年级,我们学习了二次方程ax2+bx+c=0根的判别式△=b2-4ac,学习了二次函数f(x)=ax2+bx+c与x轴有无交点的判别方法.将二次函数f(x)=ax2+bx+c化简变形得到
Into the third grade, we learn the quadratic equation ax2 + bx + c = 0 discriminant △ = b2-4ac learn the quadratic function f (x) = ax2 + bx + c with or without x-axis intersection Discriminant method. The quadratic function f (x) = ax2 + bx + c simplified deformation obtained