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二次函数y=ax2+bx+c(a≠0)图像的位置形状与解析式中系数a、b、c符号有下列关系. 1.抛物线开口向上时,a>0;在抛物线开口向下时,a<0.
The positional shape of the quadratic function y=ax2+bx+c(a≠0) image has the following relationship with the coefficients of the coefficients a, b, and c in the analytical formula. 1. When the parabola opening is upward, a>0; the parabolic opening is downward When a<0.