求函数y=(4x+3)⼀(x^2+1)的值域

2024-11-24 16:20:06
推荐回答(1个)
回答1:

4x+3=y(x^2+1)
yx^2-4x-3+y=0
b^2-4ac=16-4y(y-3)≥0
y^2-3y-4≤0
(y-4)(y+1)≤0
-1≤y≤4