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14. 將二次函數y=x2+5的圖形描繪在坐標平面上,再沿著直線y+2=0向下摺疊,並將摺疊後的圖形描繪一次,則所得到的痕跡是下列哪一個二次函數的圖形?(A) y=x2-5 (B) y=x2-9 (C
問題詳情
14. 將二次函數y=x2+5的圖形描繪在坐標平面上,再沿著直線y+2=0向下摺疊,並將摺疊後的圖形描繪一次,則所得到的痕跡是下列哪一個二次函數的圖形?
(A) y=x2-5
(B) y=x2-9
(C) y=-x2-5
(D) y=-x2-9
參考答案
答案:D
難度:
計算中
-1
書單:
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13. 用配方法將y=-2x2+12x+1化成y=-2(x+h)2+k的形式,求h+k=?(A)-20(B)21(C) 16(D) -15
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