开口向下
opens downward When the coefficient $a<0$ in the quadratic function $y=ax^2+bx+c$, its parabola opens downward.
CSCA 数学 考试术语
opens downward When the coefficient $a<0$ in the quadratic function $y=ax^2+bx+c$, its parabola opens downward.
CSCA 数学 考试术语