某班“數(shù)學(xué)興趣小組”對(duì)函數(shù);y=-x2+2|x|+3的圖象和性質(zhì)進(jìn)行了探究,探究過程如下,請(qǐng)補(bǔ)充完整.
(1)自變量x的取值范圍是全體實(shí)數(shù),x與y的幾組對(duì)應(yīng)值列表如下:
x |
… |
-4 |
-3 |
-2 |
- |
-1 |
0 |
1 |
|
2 |
3 |
4 |
… |
y |
… |
-5 |
0 |
3 |
|
4 |
3 |
4 |
|
m |
0 |
-5 |
… |
其中,m=
3
3
.
(2)根據(jù)表中數(shù)據(jù),在如圖所示的平面直角坐標(biāo)系中,直接畫出該函數(shù)的圖象.
(3)觀察函數(shù)圖象,寫出一條該函數(shù)的性質(zhì)
函數(shù)是軸對(duì)稱圖形,它的對(duì)稱軸為y軸
函數(shù)是軸對(duì)稱圖形,它的對(duì)稱軸為y軸
.
(4)已知函數(shù)y=-x+4的圖象如圖所示,結(jié)合你所畫的函數(shù)圖象.直接寫出方程-x
2+2|x|+3=-x+4的解(保留一位小數(shù),誤差不超過0.2)